[Python] Merge native and ChipStack

[mrjerryjohns]

Problem

Once #20234 merges, we'll have a split initialization model where native handles MemoryInit, and ChipStack handles the remaining bits needed for safe initialization of the stack. This is not ideal, since both are effectively serving two halves of the same initialization story.

We should remove native, and consolidate all initialization in ChipStack, and have each Python module effectively call into the ChipStack singleton to safely call into the SDK through ChipStack.Call or ChipStack.CallAsync methods.

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