Add `From<bool>` for Fields (#171) #526

Job	Run time
Bench (default)	4m 35s
Clippy lint checks	41s
Rustfmt	20s
Wasm-compatibility (wasm32-unknown-unknown)	2m 33s
Wasm-compatibility (wasm32-wasi)	2m 29s
Bench (asm)	6m 9s
Test (default)	6m 18s
Bench (bn256-table)	6m 29s
Spell Check with Typos	4s
Test (bn256-table)	6m 11s
Test (derive_serde)	6m 25s
Test (asm)	5m 55s
	48m 9s

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