Consider `clang-format` and `clang-tidy` support

[Alex Rønne Petersen]

In a similar vein to:

• #28

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?

[Alex Rønne Petersen]

For CI, we'd need to use: https://github.com/KyleMayes/install-llvm-action

[Alex Rønne Petersen]

• 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.