Introduce feature flag to switch between mimalloc major versions #144
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This PR adds a feature flag that allows switching between the latest versions of the v2 and v3 branches of mimalloc. Internally, this is solved by having two submodules for v2 and v3 that point to the same repository URL (https://github.com/microsoft/mimalloc) but different commits. The correct source is chosen in
build.rsbased on whether the 'v3' feature flag is set or not.