Refactor field tests #536

Job	Run time
Wasm-compatibility (wasm32-unknown-unknown)	2m 31s
Wasm-compatibility (wasm32-unknown-unknown)	2m 31s
Clippy lint checks	38s
Clippy lint checks	38s
Wasm-compatibility (wasm32-wasi)	2m 31s
Wasm-compatibility (wasm32-wasi)	2m 31s
Rustfmt	16s
Rustfmt	16s
Bench (default)	2m 52s
Bench (default)	2m 52s
Test (default)	4m 45s
Test (default)	4m 45s
Bench (asm)	4m 39s
Bench (asm)	4m 39s
Spell Check with Typos	51s
Spell Check with Typos	6s
Test (bn256-table)	4m 49s
Test (bn256-table)	4m 49s
Bench (bn256-table)	4m 35s
Bench (bn256-table)	4m 35s
Test (derive_serde)	4m 49s
Test (derive_serde)	4m 49s
Test (asm)	4m 35s
Test (asm)	4m 35s
	1h 14m 57s

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