test: extend file format version matrices to include 2.2

[Xuanwo]

This PR adds file format 2.2 to existing 2.0/2.1 version coverage matrices across Python and Rust test/benchmark paths.

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Parts of this PR were drafted with assistance from Codex (with gpt-5.3-codex) and fully reviewed and edited by me. I take full responsibility for all changes.

[github-actions]

PR Review

This PR extends test coverage for file format 2.2 across Python and Rust test/benchmark suites. The changes are straightforward additions to existing version matrices.

P1 Issue: Incorrect min_version in BasicTypes2_2

In python/python/tests/compat/test_file_formats.py:

@compat_test(min_version="2.0.0")
class BasicTypes2_2(UpgradeDowngradeTest):

The min_version="2.0.0" appears incorrect. Looking at the pattern:

• BasicTypes2_1 uses min_version="0.38.0" (when format 2.1 became stable)
• The library is currently at 0.x.x versioning

With min_version="2.0.0", this test would never execute since no such library version exists yet. This should be set to the Lance version where file format 2.2 became stable.

Verification

• The LanceFileVersion::V2_2 enum variant already exists in rust/lance-encoding/src/version.rs
• The version number mapping V2_2 => (2, 2) matches the Python test expectation in test_version

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Automated review by Claude

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[westonpace]

We don't have to do it now but by the time 2.3 rolls around we probably just want a file_format_versions function in python that returns a list of all the versions so we don't have to repeat ourselves all over.