feat: add an impl of Memory that uses ic0 API#2
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## Problem `BaseVec`, which is the underlying data structure used by `StableVec` and `StableMinHeap` provides a `set` method that allows the caller to change the value of an element at a specified index. The `set` method used the `memory.write` method, which assumed that there is always enough memory to rewrite the element. This assumption would've been fine if other methods like `push` always allocated the maximum amount of space for every element. Currently though, `push` only allocates the amount needed to store the element that's being pushed. ## Solution There are two possible solutions: 1) Modify `push` to always allocate the maximum size of an element. 2) Modify `set` to grow the memory as needed as it's rewriting an element. This commit implements solution #2, which was both simpler and more performant.
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