Implement `ff` traits as macros #453

Job	Run time
Rustfmt	23s
Wasm-compatibility (wasm32-unknown-unknown)	54s
Bench (default)	2m 41s
Wasm-compatibility (wasm32-wasi)	52s
Clippy lint checks	32s
Bench (asm)	2m 34s
Test (default)	1m 10s
Bench (bn256-table)	2m 41s
Test (bn256-table)	1m 13s
Spell Check with Typos	8s
Test (derive_serde)	55s
Test (asm)	58s
	15m 1s

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