[Type] Add optional support for mimalloc

[fredroy]

Mimalloc is an optimized replacement for memory management (allocation, etc)
https://github.com/microsoft/mimalloc

This is supposed to manage memory allocation better so potentially being faster and using less memory.

In our actual scenes (measured with batch mode), they are always a gain but quite modest, around 1 or 2% speedup. Benchmark on memory usage itself has not been measured.

mimalloc can be installed with apt for debian/linux (without a doubt with other distrib/packages manager) and homebrew for macos. No idea for windows, but one can always clone/build/install and set it in the cmake configuration.

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Reviewers will merge this pull-request only if

• it builds with SUCCESS for all platforms on the CI.
• it does not generate new warnings.
• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
• it is more than 1 week old (or has fast-merge label).

[hugtalbot]

I guess we should install this on the CI VM and check about the compatibility with Pixi packages, right @bakpaul ?