Filter commands by extension

[ppo]

Please allow to see all the commands coming from a given extension. And/or in "show all commands", allow to clearly identify from which extension a command is coming.

Accessibility:

• From the extension's page, in the "manage" menu (cog icon), besides "Extension Settings".
• In the "show commands" modal, allow to filter like in settings @ext:extension-id.

Use cases:

• I found a bug or have a suggestion related to a command => where should I go?
• What can I do with this extension?
• Do I really need that extension?