Consider clang-format and clang-tidy support

In a similar vein to:

Unfortunately, Zig does not currently ship with these tools, so we would have to require users to install them.

Questions:

Should we mandate a specific code style like zig fmt or let it be configurable?
Should we try to detect the presence of these tools on disk or just go ahead and invoke them if the user asked us to?
Should clang-tidy be tied to WarningLevel? Or should we maybe use AnalysisLevel/AnalysisMode?

Code style: There's too much variation in the C/C++ world. Better to let it be configurable.
Tool detection: There's virtually no precedent for doing this in the MSBuild world, so I think users would find it surprising. We should just invoke the tools if asked to and error out appropriately if they're missing.

Need to think more about where clang-tidy integration would fit in.

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