refactor(common): extract risingwave_common::estimate_size into standalone crate

[stdrc]

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What's changed and what's your intention?

To improve maintainability and maybe compile speed. No business logic is changed in this PR.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added test labels as necessary. See details.
• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).
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• My PR changes performance-critical code. (Please run macro/micro-benchmarks and show the results.)

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Documentation

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Release note

If this PR includes changes that directly affect users or other significant modifications relevant to the community, kindly draft a release note to provide a concise summary of these changes. Please prioritize highlighting the impact these changes will have on users.

[stdrc]

• refactor(common): generalize LookupEntryState to EstimatedHashSet #15843
• refactor(common): rename VecWithKvSize to EstimatedVec #15842
• refactor(common): extract risingwave_common::estimate_size into standalone crate #15841 👈
• chore(rpc client): use workspace version of lru in rpc_client #15840
• main

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