[ui] Add commands to help running queries inside selected time window.

- Added two new commands:
  - "Run query in selected time window"
    - Switches omnibox to query mode & focus query input field.
    - Autofill query with "select where ts >= ${start} and ts < ${end}
    - Place the cursor in between "select" and "where"
  - "Copy selected time window to clipboard"
    - Copies "ts >= ${start} and ts < ${end}" to the clipboard.
- In both cases, if there exists a current selection, the bounds of the
  selection are used for ${start} and ${end}. If no selection exists,
  the current visible bounds are used instead.

Bug: 293487365
Change-Id: I0953c4de0eee5c97117b03f3e4a8bb187c8dd34f