[Config] Enable W4 option for MSVC

[alxbilger]

GCC/clang has already -Wall. This PR introduces the MSVC equivalent. And yes, a lot of warnings will be generated.

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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).

[alxbilger]

Generated a 55 MB log file. Searching for warnings in the log file:

Found 1,019 matches within 0% to 3% of file. Search stopped because too many results were found.

[fredroy]

and msvc was already throwing more warnings than gcc/clang with -Wall 🫠

[bakpaul]

55 MB of text is wild.