feat: cli version argument

[HeikoWasTaken]

Summary

This PR adds version arguments (-v and --version ) to TagStudio's main entrypoint.
Version information is formatted as follows: TagStudio v{VERSION} {VERSION_BRANCH}

Examples:

## With TS 9.5.3 on main branch
$ tagstudio --version
TagStudio v9.5.3

## With TS 9.5.4 on a pre-release branch
$ tagstudio --version
TagStudio v9.5.4 Pre-Release

Seeing as this is only a small change, I've opted to open this PR without prior discussion.

Tasks Completed

• Platforms Tested:
  • Windows x86
  • Windows ARM
  • macOS x86
  • macOS ARM
  • Linux x86
  • Linux ARM
• Tested For:
  • Basic functionality
  • PyInstaller executable

[HeikoWasTaken]

One caveat. Due to the way logging and argument parsing is set up, some logging info is printed just before the version is displayed. Hiding those logs specifically when tagstudio --version is invoked would require considerably more refactoring, and is out of the scope of this PR.

So the output of running tagstudio --version looks more like this in reality:

$ tagstudio --version
2025-08-26 04:22:52 [info     ] [FFmpeg] Using FFprobe location: ffprobe (Found)
2025-08-26 04:22:52 [info     ] [FFmpeg] Using FFmpeg location: ffmpeg (Found)
2025-08-26 04:22:52 [info     ] [ResourceManager] Resources Registered: count=34
TagStudio v9.5.3

[xarvex]

The quirks with the logging executing before the arguments are parsed is due to something firing off the moment it is imported, and something I am addressing now after pulling this PR locally and testing. In terms of what you've done here, this is all good and mergeable. Thanks for the PR!