feat: user address space functionality #246
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…al `with_user_memory_access`
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The basic features of userspace
AddressSpaceshave been present for a while now, but while integrating the WASM runtime I discovered that actually the APIs aren't quite there yet to support the necessary features.The implementation of usercopy primitives was a big step and this PR continues this by evolving the
MmapSlicestruct.