Window Functions : Improve performance by comparing Strings in frame bytes without converting them

[sreemanamala]

Description

After this PR RACs are serialised and transferred over wire.
This commit tries to compare the bytes directly in the NaiveSorter without converting them to Strings.
In combination, these are aiming to reduce the window query times
Also, added a new benchmark with group by __time

previous benchmark results when committed with the Benchmark PR:

current benchmark results:

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Key changed/added classes in this PR

• StringFrameColumnReader
• SqlWindowFunctionsBenchmark

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This PR has:

• been self-reviewed.
  • using the concurrency checklist (Remove this item if the PR doesn't have any relation to concurrency.)
• added documentation for new or modified features or behaviors.
• a release note entry in the PR description.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage is met.
• added integration tests.
• been tested in a test Druid cluster.

[kgyrtkirk]

latest change compares null-s correctly