refactor(common): rename VecWithKvSize to EstimatedVec

[stdrc]

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What's changed and what's your intention?

As simple as title, so that we will keep the estimate_size::collections module neat.💦

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[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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