feat: memory64 support (#38) #350

Job	Run time
Build wasm	1m 44s
Run tests on Linux x86 (stable)	46s
Run tests on Linux x86 (nightly)	59s
Run tests on Linux x86 (stable, no default features)	42s
Run tests on Linux x86 (nightly, no default features)	1m 0s
Run tests on macOS arm64 (Apple M1)	1m 3s
Run tests on Linux arm64	2m 54s
Run tests on Linux armv7	2m 57s
	12m 5s

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