[llvm-lit] Add Windows .cmd wrapper to make llvm-lit directly runnable (#155226) On Linux/Mac, `llvm-lit` is configured with a shebang and made executable so tools like LNT and the test-suite can invoke it directly. On Windows the build only produces `llvm-lit.py` which cannot be used as a standalone executable. This caused problems when running the LLVM test-suite via LNT or buildbots. This change introduces a new template file `llvm-lit.cmd.in` and updates `llvm/utils/llvm-lit/CMakeLists.txt` so that a corresponding `llvm-lit.cmd` is generated in the `build/bin` directory (for both single-config and multi-config generators). The wrapper simply invokes the configured Python interpreter on the adjacent `llvm-lit.py` and propagates the exit code. This ensures that `llvm-lit` can be used as a direct executable on Windows just like on Linux without requiring external wrappers or modifications in buildbot scripts or LNT.
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