## Summary of the Pull Request
Introduces a new command called `moveTab`
This command has a single mandatory argument with values of `forward` and `backward`
## PR Checklist
* [x] Closes https://github.com/microsoft/terminal/issues/3593
* [x] CLA signed.
* [x] Tests added/passed
* [x] Documentation updated here: https://github.com/MicrosoftDocs/terminal/pull/198
* [x] Schema updated
* [x] I've discussed this with core contributors already.
## Detailed Description of the Pull Request / Additional comments
Went for the straightforward solution of moving the tab and the tabViewItem.
## Validation Steps Performed
* Manual testing
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