refactor: improve naming of BTreeMap inner key/value storage

[maksymar]

This PR refactors the internal storage of BTreeMap nodes by renaming the keys_and_encoded_values field to entries and updating all related references across versioned implementations.

[Copilot]

Pull Request Overview

This PR refactors the internal storage of BTreeMap nodes by renaming the keys_and_encoded_values field to entries and updating all related references across versioned implementations.

• Rename keys_and_encoded_values to entries in node.rs, node/v1.rs, and node/v2.rs
• Update loops, asserts, methods, and struct initializers to use entries

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/btreemap/node/v2.rs	Renamed keys_and_encoded_values to entries and updated related loops and struct fields in V2
src/btreemap/node/v1.rs	Renamed keys_and_encoded_values to entries and updated related loops and struct fields in V1
src/btreemap/node.rs	Renamed struct field and all method accesses from keys_and_encoded_values to entries

Comments suppressed due to low confidence (1)

src/btreemap/node/v2.rs:153

• EAGER_LOAD_KEY_SIZE_THRESHOLD is defined but never used; consider removing this constant or applying it to gate eager key loading logic.

const EAGER_LOAD_KEY_SIZE_THRESHOLD: u32 = 16;

[github-actions]

canbench 🏋 (dir: ./benchmarks/vec) 4957a42 2025-06-05 08:11:00 UTC

✅ ./benchmarks/vec/canbench_results.yml is up to date
📦 canbench_results_vec.csv available in artifacts

---------------------------------------------------

Summary:
  instructions:
    status:   No significant changes detected 👍
    counts:   [total 16 | new 0 | improved 0 | regressed 0 | unchanged 16]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

  heap_increase:
    status:   No significant changes detected 👍
    counts:   [total 16 | new 0 | improved 0 | regressed 0 | unchanged 16]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

  stable_memory_increase:
    status:   No significant changes detected 👍
    counts:   [total 16 | new 0 | improved 0 | regressed 0 | unchanged 16]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

---------------------------------------------------
CSV results saved to canbench_results.csv

[github-actions]

canbench 🏋 (dir: ./benchmarks/memory_manager) 4957a42 2025-06-05 08:10:53 UTC

✅ ./benchmarks/memory_manager/canbench_results.yml is up to date
📦 canbench_results_memory-manager.csv available in artifacts

---------------------------------------------------

Summary:
  instructions:
    status:   No significant changes detected 👍
    counts:   [total 3 | new 0 | improved 0 | regressed 0 | unchanged 3]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

  heap_increase:
    status:   No significant changes detected 👍
    counts:   [total 3 | new 0 | improved 0 | regressed 0 | unchanged 3]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

  stable_memory_increase:
    status:   No significant changes detected 👍
    counts:   [total 3 | new 0 | improved 0 | regressed 0 | unchanged 3]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

---------------------------------------------------
CSV results saved to canbench_results.csv

[github-actions]

canbench 🏋 (dir: ./benchmarks/btreemap) 4957a42 2025-06-05 08:12:41 UTC

✅ ./benchmarks/btreemap/canbench_results.yml is up to date
📦 canbench_results_btreemap.csv available in artifacts

---------------------------------------------------

Summary:
  instructions:
    status:   No significant changes detected 👍
    counts:   [total 285 | new 0 | improved 0 | regressed 0 | unchanged 285]
    change:   [max +269.56K | p75 0 | median 0 | p25 0 | min -1.03M]
    change %: [max +0.06% | p75 0.00% | median 0.00% | p25 0.00% | min -0.17%]

  heap_increase:
    status:   No significant changes detected 👍
    counts:   [total 285 | new 0 | improved 0 | regressed 0 | unchanged 285]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

  stable_memory_increase:
    status:   No significant changes detected 👍
    counts:   [total 285 | new 0 | improved 0 | regressed 0 | unchanged 285]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

---------------------------------------------------
CSV results saved to canbench_results.csv

[github-actions]

canbench 🏋 (dir: ./benchmarks/compare) 4957a42 2025-06-05 08:11:47 UTC

✅ ./benchmarks/compare/canbench_results.yml is up to date
📦 canbench_results_compare.csv available in artifacts

---------------------------------------------------

Summary:
  instructions:
    status:   No significant changes detected 👍
    counts:   [total 18 | new 0 | improved 0 | regressed 0 | unchanged 18]
    change:   [max +53.05M | p75 0 | median 0 | p25 0 | min -8.77K]
    change %: [max +0.06% | p75 0.00% | median 0.00% | p25 0.00% | min -0.00%]

  heap_increase:
    status:   No significant changes detected 👍
    counts:   [total 18 | new 0 | improved 0 | regressed 0 | unchanged 18]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

  stable_memory_increase:
    status:   No significant changes detected 👍
    counts:   [total 18 | new 0 | improved 0 | regressed 0 | unchanged 18]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

---------------------------------------------------
CSV results saved to canbench_results.csv