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.record.json

@@ -1,7 +1,7 @@
 {
-  "data": { "id": 1, "name": "Ada Lovelace", "email": "ada@example.test", "slug": "ada-lovelace", "joined_ip": "203.0.113.7", "permissions": { "legacy.code": 1, "posts.edit": 1, "reports.export": 1 } },
+  "data": { "id": 1, "name": "Ada Lovelace", "email": "ada@example.test", "team": 2, "tags": [5, 6], "slug": "ada-lovelace", "joined_ip": "203.0.113.7", "permissions": { "legacy.code": 1, "posts.edit": 1, "reports.export": 1 } },
   "meta": {
-    "labels": {},
+    "labels": { "team": [{ "value": 2, "label": "Home" }], "tags": [{ "value": 5, "label": "staff", "locked": true }, { "value": 6, "label": "news" }] },
     "actions": [
       { "name": "activate", "label": "Activate" },
       { "name": "reinstate", "label": "Reinstate", "confirm": "Lift the ban on this person?" }