ICU-22921 Add windows script doing jar extraction

[mihnita]

The longer term fix would be to do it in Python, which would be cross-platform.

But that would need some "foundations":

• where to put all the scripts
• support modules (logging, exec, file system manipulation)

Checklist

• Required: Issue filed: ICU-22921
• Required: The PR title must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
• Required: Each commit message must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
• Issue accepted (done by Technical Committee after discussion)
• Tests included, if applicable
• API docs and/or User Guide docs changed or added, if applicable

[echeran]

RSLGTM

[markusicu]

It's a bit of a stretch for the "docs minor fixes" ticket, but... ok.

Also mostly-rs...lgtm.

@rp9-next @eggrobin FYI

[mihnita]

It's a bit of a stretch for the "docs minor fixes" ticket, but... ok.

ACK.
Thank you.