Replace `String` with `CompactString` #1343

Job	Run time
WASM version	2m 17s
Extract crate metadata	2s
Ensure 'cargo fmt' has been run	6s
Documentation checks	6m 2s
Minimum supported rust version	2m 3s
aarch64-unknown-linux-gnu (ubuntu-20.04)	3m 47s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	3m 46s
arm-unknown-linux-musleabihf (ubuntu-20.04)	3m 59s
i686-pc-windows-msvc (windows-2019)	7m 37s
i686-unknown-linux-gnu (ubuntu-20.04)	3m 34s
i686-unknown-linux-musl (ubuntu-20.04)	3m 59s
x86_64-apple-darwin (macos-12)	4m 43s
x86_64-pc-windows-msvc (windows-2019)	7m 29s
x86_64-unknown-linux-gnu (ubuntu-20.04)	3m 28s
x86_64-unknown-linux-musl (ubuntu-20.04)	3m 35s
	56m 27s

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