[clang] [libclang/python] Change all global variables to snake case (PR #132378)

[Vlad Serebrennikov via cfe-commits]

================
@@ -10,7 +10,7 @@
 import sys
 from pathlib import Path
 
-kInputsDir = os.path.join(os.path.dirname(__file__), "INPUTS")
+k_inputs_dir = os.path.join(os.path.dirname(__file__), "INPUTS")
----------------
Endilll wrote:

Can you also drop `k_` prefix? According to PEP 8, naming convention for global variables is the same as for functions, and we don't prefix functions with `k_`.

https://github.com/llvm/llvm-project/pull/132378