Support Tab Groups

[SamHasler]

Chrome now has tab groups:

https://blog.google/products/chrome/manage-tabs-with-google-chrome/

Add support for:

• Displaying tabs in their existing groups in the main window keeping up to date as groupings change via Chrome UI:
  • group tabs
  • ungroup tabs
  • tab move in/out of group
  • group moves within/between windows
• Editing the group name
• Editing the group colour
• Saving the grouping data for later restore (tabs in group, name and colour)
• Restoring tab groups with name and colour
• Dragging tabs between groups via Tab Fern
  • Grouping tabs (with name and colour)
  • Ungrouping tabs
  • Move tab in/out/between of groups
  • Group moves within/between windows

API Reference: https://developer.chrome.com/docs/extensions/reference/tabs/#method-group https://developer.chrome.com/docs/extensions/reference/tabs/#method-ungroup https://developer.chrome.com/docs/extensions/reference/tabs/#event-onCreated https://developer.chrome.com/docs/extensions/reference/tabs/#event-onUpdated

Relevant Issues:

• Closes get fired before TabGroup closes
• Don't emit an event on every letter entry on tab group name change for chrome.tabGroups.onUpdated
• Signature for chrome.tabGroups.onUpdated.addListener contradicts the spec

[SamHasler]

Closing as duplicate of #246