Fullscreen yaml editor

[Joshua-Beatty]

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Description

Adds a new button to the compose editor that opens the compose editor in full screen.

Type of change

• User interface (UI)
• New feature (non-breaking change which adds functionality)

Checklist

• My code follows the style guidelines of this project
• I ran ESLint and other linters for modified files
• I have performed a self-review of my own code and tested it
• I have commented my code, particularly in hard-to-understand areas
  (including JSDoc for methods)
• My changes generate no new warnings
• My code needed automated testing. I have added them (this is optional task)

Screenshots (if any)

[jwidess]

This would be a phenomenal addition, especially as the current YAML editor doesn't handle long lines properly and displays them incorrectly as additional lines, rather than correct line wrapping. Example image below where lines 55 and 56 are actually the same line.