Meta: Add basic clang-tidy configuration

Add a basic clang-tidy configuration that enables checks from the
following categories:

- bugprone
- cert
- clang-analyzer
- concurrency
- misc
- performance
- portability
- readability

The noisiest rules that have conflicts with the project style guide or
accepted practices have been turned off.

There's absolutely more work to be done here before we could consider
setting any of these warnings as errors and enforcing them in CI, but
committing a project clang-tidy configuration should help the rules
become more visible and let other contributors take a crack at tweaking
rules and/or finding possible bugs.

Sadly the cpp-core-guidelines and modernize categories are very, very
noisy. If we want to enable rules from these categories, they would need
to be on a rule by rule basis.

AK/.clang-tidy

@@ -0,0 +1,7 @@
+---
+# Disabled checks:
+#
+# misc-unused-using-decls: AK exports all public names into the global namespace per project style
+#
+Checks: '-misc-unused-using-decls'
+InheritParentConfig: true