Refactor the internals of vm::Memory to simplify the RuntimeLinearMemory trait
#9577
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Instead of storing just a trait object store instead an `enum` between "local" memory and shared memory. This helps remove redundant trait impls on shared memories, removes the need for `dyn Any`, and removes the possibility of wrapping a shared memory as a shared memory. This is additionally intended to make it a bit easier to see what's nested where and reduce some layers of indirection.
This is intended to be a non-shared implementation of a linear memory with various bits and pieces tracking state. The end goal is to simplify the `RuntimeLinearMemory` trait to its bare bones necessary to faithfully implement wasm linear memory.
Further simplify `RuntimeLinearMemory` by moving these responsibilities up a layer into the `LocalMemory` structure.
No need to plumb it through all the traits any more. Now it's possible to only have it handled in `LocalMemory` and other pieces don't have to worry about it.
Further simplify custom traits and mmap/static memory by moving more responsibility into `LocalMemory`.
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This is a series of commits which have the end-goal of removing the
RuntimeLinearMemorytrait and replacing it withwasmtime::LinearMemory. In doing this though I wanted to simplify the trait to move more responsibilities up a layer so it's clearer what the safety contracts are and what exactly is required on behalf of embedders. This moves many of the responsibilities to a newLocalMemorytype rather than having most of the functionality implemented through trait methods. This provides, for example, a vector of having CoW support in Wasmtime without supporting it throughLinearMemory(or not officially at least).Each commit here is probably best viewed one-at-a-time since this adds up to a number of changes but I've tried to keep things separated and have tests passing for each individual commit.
Fixes #9568