[feature] Instance rules (#2125)

* init instance rules database model, admin api

* expose instance rules in public instance api

* public /api/v1/instance/rules route

* GET ruleById

* createRule route

* createRule auth check

* updateRule

* deleteRule

* list rules on about page

* ruleGet auth

* add about page ids for anchors

* process and store adding violated rules to reports

* admin api models for instance rules

* instance rule edit frontend

* change rule inputs to textareas

* database fixes after rebase (#2124)

* remove unused imports

* fix db migration column name

* fix tests

* fix more tests

* fix postgres error with wrongly used Ident

* add some tests, fiddle with rule model a bit, fix postgres migration

* swagger docs

---------

Co-authored-by: tsmethurst <tobi.smethurst@protonmail.com>

testrig/db.go

@@ -61,6 +61,7 @@ var testModels = []interface{}{
 	&gtsmodel.EmojiCategory{},
 	&gtsmodel.Tombstone{},
 	&gtsmodel.Report{},
+	&gtsmodel.Rule{},
 	&gtsmodel.AccountNote{},
 }
 
@@ -160,6 +161,12 @@ func StandardDBSetup(db db.DB, accounts map[string]*gtsmodel.Account) {
 		}
 	}
 
+	for _, v := range NewTestRules() {
+		if err := db.Put(ctx, v); err != nil {
+			log.Panic(nil, err)
+		}
+	}
+
 	for _, v := range NewTestDomainBlocks() {
 		if err := db.Put(ctx, v); err != nil {
 			log.Panic(nil, err)