Resolve "Add view filter where link row contains"

Merge Request Checklist

• changelog.md has been updated if required
• Documentation has been updated
• Quality Standards are met
• The UI/UX has been updated following UI Style Guide
• The redoc API pages have been updated for any REST API changes
• The per database user API docs page has been updated for any REST API changes made to endpoints which can be accessed via a user created token
• Has performance been considered and tested when appropriate? Ideally Baserow should be performant when working with hundreds of thousands of rows
• New/Changed Premium features are separated correctly in the premium folder

Closes #163 (closed)

What has changed

This newly introduced filter called link_row_has makes it possible to filter rows based on if a link row value contains a relationship with the selected row. Newly introduced is the filter preload_values which, in this case, preloads the display name of the related row to improve the user experience. The preloading is done just before a view filter is serialized.

Testing pointers

• It should be possible to choose a row in the related table when using this filter.
• Switching between filter types and fields should work.
• The primary field name of the related row should be visible as value.
• Real time collaboration should update the visible name of the chosen row.
• The web-frontend filter check should work.
• All the filter inputs should be tested because I refactored some parts.

Jul-28-2021_20-41-41