CASSANDRA-20918 Add cursor-based low allocation optimized compaction implementation

[nitsanw]

patch by Nitsan Wakart; reviewed by TBD for CASSANDRA-TBD

• EPPv1 - all new code
• Cursor compaction integration
• JMH benchmarks for compaction and cursor impls
• EPPv1 - New tests
• Existing tests tweaks for new code
• [revert?] change the default partitioner to expand testing of new code
• [revert?] test data used some benchmarks
• [revert?] jmh tweak GC settings for stability
• [revert?] javadoc typos, marking unused params
• [revert?] clarifying comment
• [revert?] toString improvement
• [revert?] remove spurious keywords
• [revert?] marking metadata collection
• [revert?] cursor verifier
• Exclude SAI and counter column
• Exclude BTI and legacy versions
• Temporarily skip very long running test

Thanks for sending a pull request! Here are some tips if you're new here:

• Ensure you have added or run the appropriate tests for your PR.
• Be sure to keep the PR description updated to reflect all changes.
• Write your PR title to summarize what this PR proposes.
• If possible, provide a concise example to reproduce the issue for a faster review.
• Read our contributor guidelines
• If you're making a documentation change, see our guide to documentation contribution

Commit messages should follow the following format:

<One sentence description, usually Jira title or CHANGES.txt summary>

<Optional lengthier description (context on patch)>

patch by <Authors>; reviewed by <Reviewers> for CASSANDRA-#####

Co-authored-by: Name1 <email1>
Co-authored-by: Name2 <email2>

The Cassandra Jira