Add MSCCLPP_GIT_COMMIT micro

[Binyang2014]

• Add MSCCLPP_GIT_COMMIT micro
• Update docs

[Copilot]

Pull Request Overview

This PR refactors version management by extracting version definitions from core.hpp into a dedicated template file and adds Git commit tracking capability.

• Moves version constants from hardcoded values in core.hpp to a configurable version.hpp.in template
• Adds MSCCLPP_GIT_COMMIT macro to track Git commit hashes
• Updates build system to generate version.hpp from template and include Git hash detection

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
include/mscclpp/version.hpp.in	New template file defining version macros and Git commit hash
include/mscclpp/core.hpp	Removes hardcoded version definitions and includes generated version.hpp
include/CMakeLists.txt	Updates to include generated headers in build configuration
docs/programming_guide.rst	Adds new documentation reference
CMakeLists.txt	Adds Git hash detection and version.hpp generation logic
.github/workflows/update-version.yml	Removes redundant version update steps now handled by template

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[seagater]

The PR looks good. There are no other files rely on version and no new dependency besides of Git.