feat(12.1-02): writable foreign keys, locked relation options, invisible columns

- FieldRelationContract.WritableForeignKey makes a belongsTo field over a
  protected foreign key writable; the protected key list is unchanged
- cabana.RelationLockProvider names related ids an administrator may not add
  or remove: options and labels carry locked, and a create or update that
  changes the locked subset is 403 before any row is written
- columns.yaml invisible keeps a column searchable and out of the rows
- a controller implementing pact.FilterOptions serves a scope filter's
  choices before the model
- SPA: locked chips and options in RelationField, DataTable skips invisible
  columns
- README, docs, OpenAPI document, TS types and dist updated

modules/cabana/testdata/roster/models/person/columns.yaml

@@ -5,3 +5,6 @@ columns:
     email:
         label: acme.roster::lang.people.email
         searchable: true
+        invisible: true
+    slug:
+        label: acme.roster::lang.people.slug

modules/cabana/testdata/roster/models/person/fields.yaml

@@ -7,6 +7,15 @@ fields:
         label: acme.roster::lang.people.email
         type: text
         span: right
+    team:
+        label: acme.roster::lang.people.team
+        type: relation
+        nameFrom: name
+        emptyOption: acme.roster::lang.people.no_team
+    tags:
+        label: acme.roster::lang.people.tags
+        type: relation
+        nameFrom: name
     slug:
         label: acme.roster::lang.people.slug
         type: text