Add Multiple Actions Command

[Rosefield]

For this PR

• Add action to run multiple actions. microsoft/terminal#11045

I wasn't sure if it fit in any of the other categories so I just made it its own.

NB: the example as written will not work until this bug is fixed

• Switching tab as part of running multiple actions does not focus tab immediately microsoft/terminal#11107

[opbld33]

Docs Build status updates of commit 76ed625:

✅ Validation status: passed

File	Status	Preview URL	Details
TerminalDocs/customize-settings/actions.md	✅Succeeded	View

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