[api] [database] New, migrate to new FAB API side by side (#7665)

* [api] [database] New, migrate to new FAB API side by side

* [database] view and api module reorganization

* [style] Fix, flake8

* [test] [database] Fix, tests for new database view structure

* [style] [database] black

* [database] Fix, missing apache license

* Migrate databaasync api to the new api

* flake8

* More efficient api call

* Revert querySearch to old API, test

* dummy commit

* revert config.py commit

* Remove unused import

* Remove old API view

* Remove new API view

* Add database filter

* Add database filter

* Add database filter

* Remove comments on js

* Fix JS test

* Fix pylint

* QuerySearch new databaseasync API endpoint

* Fix, query search new api endpoint

* Reintroduce old API for smooth side by side migration

* Better naming and use common hooks for view and API

* black it

* Fix, database mixin must come first

* Fix, lint

superset/assets/src/SqlLab/components/QuerySearch.jsx

@@ -207,7 +207,7 @@ class QuerySearch extends React.PureComponent {
           <div className="col-sm-2">
             <AsyncSelect
               onChange={this.onChange}
-              dataEndpoint="/databaseasync/api/read?_flt_0_expose_in_sqllab=1"
+              dataEndpoint="/api/v1/database/?q=(filters:!((col:expose_in_sqllab,opr:eq,value:!t)))"
               value={this.state.databaseId}
               mutator={this.dbMutator}
               placeholder={t('Filter by database')}