Add take & restore for better in place control

[nixonyh]

• Add take & restore to remove & re-insert items from SparseMap in place.

Additional fixes/changes

• Fix a bug in remove where item is removed even when generation mismatches.
• Add PLACEHOLDER for Key

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 7032ea1 and b4409bb.

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• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (2)

• Cargo.toml
• src/lib.rs

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