Added shortcut to focus filters

What does this MR do?

Adds shortcut f to focus filter inputs.

Are there points in the code the reviewer needs to double check?

Is this a valid implementation?

Please check this comment below!

Why was this MR needed?

Keyboard ninja UX ⚔

What are the relevant issue numbers?

Closes #18120 (closed).

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together