cppwinrt code base should have .editorconfig and/or clang-tidy formatting enforced automatically

[dmachaj]

Version

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Summary

There is nothing enforcing coding style consistency so there is variance that creeps in over time (e.g. some files have tabs, some have spaces). It would be nice to use automation to enforce at least a bare minimum of consistency so that there is one less thing to think about.

Reproducible example

Expected behavior

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Actual behavior

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Additional comments

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