ui: Move query tab & omnibox SQL mode into QueryPage plugin (#5040)

- Create a new registration system to allow plugins to register omnibox
modes.
- Use this registration to move the query mode into the QueryPage
plugin.
- Move everything related to query tabs into the QueryPage plugin.
- Remove addQueryResultsTab() from extensions (extensions are a hack and
are slowly being removed).
- Create new 'Slice Statistics' section in the generic slice details
panel 'ThreadSliceDetailsPanel' to show the average duration of all
slices with the same name, rather than having this open up in a new
query results tab.
- This change is to solve a dependency issue, but I believe it to be a
much more elegant and useful solution.
- In the future, we could replace this with a histogram, but this is out
of scope for this PR.

<img width="704" height="508" alt="image"
src="https://github.com/user-attachments/assets/7d39dc67-67ae-4217-b71e-3ae64e12683e"
/>

Author: stevegolton

test/data/ui-screenshots/aggregation.test.ts/frametimeline/frame-timeline-aggregation.png.sha256

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