Add support for Conditional Fields (#6864)

* Add conditions field to directus_fields

* Add conditions configuration

* Apply conditional overrides

* Handle conditions in nested groups

* Fix reverse mutating conditions

* Start on filter setup interface

* Move field types/constants to shared

* [WIP] Updated client side filter validation

* Support logical operators in client validation step

* Use new validation util in conditions check

* Add nesting in filter seutp

* Add filter rule setup configurator

* Fixes that should've been done in the merge

* Strip out filter-settings interface

TBD in a new PR

* Move browser to index

api/src/database/system-data/fields/fields.yaml

@@ -73,3 +73,8 @@ fields:
   - collection: directus_fields
     field: note
     width: half
+
+  - collection: directus_fields
+    field: conditions
+    hidden: true
+    special: json