Print Version

[ax3l]

Print the HiPACE++ version to the terminal. Fetched from git as usual. Will use a proper tag-prefixed description as soon as we add tags in the git history.

Same as ECP-WarpX/WarpX#1820

• Small enough (< few 100s of lines), otherwise it should probably be split into smaller PRs
• Tested (describe the tests in the PR description)
• Runs on GPU (basic: the code compiles and run well with the new module)
• Contains an automated test (checksum and/or comparison with theory)
• Documented: all elements (classes and their members, functions, namespaces, etc.) are documented
• Constified (All that can be const is const)
• Code is clean (no unwanted comments, )
• Style and code conventions are respected at the bottom of https://github.com/Hi-PACE/hipace
• Proper label and GitHub project, if applicable

[MaxThevenet]

Look great, thanks! Just checked, AMReX also prints the version, so we're good to go.