Mastodon supports in-query search operators, such as `has:image`,
`language:en`, or `in:library`. Previously the user had to enter them in
to the query directly.
This provides a chip-based UI that allows the user to set values for
these operators.
## Server
- Add new search capabilities to record the faceted search features the
server reports.
- Update definitions for Mastodon, Friendica, and GoToSocial to specify
which versions of the operations they support.
## SearchOperator / SearchOperatorViewData
- Represents each supported operator and associated viewdata.
## SearchActivity / activity_search.xml
- Conditionally display a chip for each facet depending on the server's
level of support.
- Implement the UI for each chip. They display dialogs of varying levels
of complexity depending on the underlying operation.
## FragmentSearch
- Display the progress as a LinearProgressIndicator instead of an
indeterminate ProgressBar. This makes it more visible under the search
facets.
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