feat(masm): refactor assembler into a more compiler-like architecture #4691

Job	Run time
rustfmt	16s
Clippy	1m 4s
Check Rust stable on ubuntu with --all-targets --no-default-features	1m 6s
no-std (stable, wasm32-unknown-unknown)	1m 16s
Check Rust stable on ubuntu with --all-targets	1m 9s
no-std (nightly, wasm32-unknown-unknown)	1m 29s
Test Rust nightly on windows-2022	0s
Check Rust stable on ubuntu with --all-targets --all-features	1m 13s
Test Rust stable on ubuntu with --profile test-release	6m 38s
Check Rust nightly on ubuntu with --all-targets --no-default-features	1m 18s
Test Rust stable on ubuntu with --profile test-release --doc	3m 25s
Check Rust nightly on ubuntu with --all-targets	1m 5s
Test Rust nightly on ubuntu with --profile test-release	6m 22s
Check Rust nightly on ubuntu with --all-targets --all-features	1m 16s
Test Rust nightly on ubuntu with --profile test-release --doc	3m 29s
	31m 6s

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