MSM optimisations: CycloneMSM #375

Job	Run time
Rustfmt	14s
Wasm-compatibility (wasm32-unknown-unknown)	1m 5s
Clippy lint checks	33s
Wasm-compatibility (wasm32-wasi)	1m 1s
Bench (default)	14m 57s
Bench (asm)	15m 19s
Test (default)	10m 42s
Bench (bn256-table)	15m 33s
Test (bn256-table)	10m 38s
Test (derive_serde)	10m 58s
Test (asm)	10m 10s
	1h 31m 10s

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