feat: Implement `ShrinkToFit` for `serde_json::Value` and some std ty… #154

Job	Run time
Cargo clippy	25s
Check license of dependencies	35s
Check (ubuntu-latest)	30s
Cargo fmt	13s
Check (macos-latest)	37s
Cargo test	35s
Check (windows-latest)	2m 27s
Done	1s
Publish	27s
	5m 50s

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