vim: Add global marks (#25702)

Closes https://github.com/zed-industries/zed/issues/13111

Release Notes:

- vim: Added global marks `'[A-Z]`
- vim: Added persistence for global (and local) marks. When re-opening
the same workspace your previous marks will be available.

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Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>