Tests

feat: serialization to and from felts #1433

Job	Run time
Unix tests (ubuntu-latest, stable)	2m 2s
Unix tests (ubuntu-latest, nightly)	1m 47s
Unix tests (macos-13, stable)	2m 47s
Unix tests (macos-13, nightly)	3m 34s
no-std build	44s
WASM tests	3m 51s
Unix tests (macos-14, stable)	1m 37s
Windows tests (stable, x86_64-pc-windows-gnu)	4m 45s
Unix tests (macos-14, nightly)	1m 55s
Windows tests (stable, x86_64-pc-windows-msvc)	4m 21s
Windows tests (nightly, x86_64-pc-windows-gnu)	4m 13s
Windows tests (nightly, x86_64-pc-windows-msvc)	3m 45s
	35m 21s

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