### What?
Makes it possible to filter join documents using a `where` added
directly in the config.
### Why?
It makes the join field more powerful for adding contextual meaning to
the documents being returned. For example, maybe you have a
`requiresAction` field that you set and you can have a join that
automatically filters the documents to those that need attention.
### How?
In the database adapter, we merge the requested `where` to the `where`
defined on the field.
On the frontend the results are filtered using the `filterOptions`
property in the component.
Fixes
https://github.com/payloadcms/payload/discussions/8936https://github.com/payloadcms/payload/discussions/8937
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Co-authored-by: Sasha <64744993+r1tsuu@users.noreply.github.com>
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