add support for rangeByCompoundKeyPrefix

[somdoron]

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[Copilot]

Pull Request Overview

This PR adds support for compound key prefix queries in HMap by introducing the rangeByCompoundKeyPrefix method and refactoring the prefix upper bound calculation logic. The changes enable efficient querying of entries grouped by the first component of compound keys (e.g., fetching all users in a namespace).

• Extracted computePrefixUpperBound as a reusable helper method for computing lexicographic upper bounds
• Added rangeByCompoundKeyPrefix method for querying entries by compound key prefix
• Added comprehensive test coverage for both the new functionality and the refactored helper method

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
raft/src/main/scala/zio/raft/HMap.scala	Refactored prefix upper bound calculation into standalone computePrefixUpperBound method; added rangeByCompoundKeyPrefix API with extensive documentation; changed visibility of byteArrayOrdering to private[raft]
raft/src/test/scala/zio/raft/HMapRangeByCompoundKeyPrefixSpec.scala	New test suite validating compound key prefix queries with various scenarios including empty second components, unicode characters, and multiple entries
raft/src/test/scala/zio/raft/HMapPrefixRangeSpec.scala	Added three new tests for computePrefixUpperBound method covering basic functionality, max byte values, and trailing zero truncation

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