feat(keyboard-shortcuts): add customizable keyboard shortcuts

[grantfitzsimmons]

Begins to fix #1746

Rebased #5097 onto main, resolved the resulting conflicts. The keyboard-shortcut preferences now expose user tools directly (rather than as cryptic URLs), plus their icons, while URL-based shortcuts remain available as an advanced option (not sure how useful it will be in practice).

Dialog actions can also be configured, including shortcuts for closing and saving when those actions are available. I want to review what makes sense to prevent accidental misfires. Perhaps we combine the c or s keys with Alt/Command?

Checklist

• Self-review the PR after opening it to make sure the changes look good
  and self-explanatory (or properly documented)
• Add automated tests
• Add relevant issue to release milestone

Testing instructions

• Added Keyboard Shortcuts item to User tools - verify it looks good
• For each shortcut on the Keyboard Shortcuts page that has a default value assigned, make sure that the default keyboard shortcuts we have set do not already have an action assigned to them (we don't want to overwrite default browser or OS actions, unless we really have to, or unless user would expect us to do so)
  • i.e open any non-specify webpage (google.com) and see if this key does anything (this needs to be verified in non-specify pages because if specify collides with a system shortcut, specify will take priority, and so you may not even know that it collides)
  • Verify this on Windows in Chrome and Firefox
  • Verify this on macOS in Chrome and Safari
  • (if possible) Verify this on Linux in Firefox
• Check if any other common action is missing a keyboard shortcut that you believe we should add
• Verify the ability to set a keyboard shortcut to any page (see feat(KeyboardShortcuts): add customizable shortcuts for common actions #5097 (comment))

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