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

admin/tests/fixtures/roster.form-schema.json

@@ -5,6 +5,8 @@
     "fields": [
       { "name": "name", "type": "text", "label": "Name", "span": "left" },
       { "name": "email", "type": "text", "label": "Email", "span": "right" },
+      { "name": "team", "type": "relation", "label": "Team", "nameFrom": "name", "emptyOption": "No team" },
+      { "name": "tags", "type": "relation", "label": "Tags", "nameFrom": "name", "multiple": true },
       { "name": "slug", "type": "text", "label": "Slug", "preset": { "field": "name", "type": "slug" } },
       { "name": "password", "type": "password", "label": "Password", "span": "left", "context": ["create", "update"] },
       { "name": "password_confirmation", "type": "password", "label": "Repeat the password", "span": "right", "context": ["create", "update"] },