chore: simplify ToWasmTypes traits, general cleanup #628

Job	Run time
Build wasm	2m 29s
Run tests on Linux x86 (stable)	1m 16s
Run tests on macOS arm64 (Apple M1)	1m 24s
Run tests on Linux x86 (nightly)	1m 7s
Run tests on Linux x86 (nightly, no default features)	1m 29s
Run tests on Linux armv7	4m 55s
Run tests on Linux arm64	3m 57s
Run tests on Linux x86 (stable, no default features)	1m 16s
	17m 53s

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