Preparations for removing BaseDendrite (#3016)

Preparations to actually remove/replace `BaseDendrite`.
Quite a few changes:
- SyncAPI accepts an `fulltext.Indexer` interface (fulltext is removed
from `BaseDendrite`)
- Caches are removed from `BaseDendrite`
- Introduces a `Router` struct (likely to change)
  - also fixes #2903
- Introduces a `sqlutil.ConnectionManager`, which should remove
`base.DatabaseConnection` later on
- probably more

federationapi/storage/storage_test.go

@@ -7,26 +7,28 @@ import (
 	"time"
 
 	"github.com/matrix-org/dendrite/federationapi/storage"
+	"github.com/matrix-org/dendrite/internal/caching"
+	"github.com/matrix-org/dendrite/internal/sqlutil"
 	"github.com/matrix-org/dendrite/setup/config"
 	"github.com/matrix-org/dendrite/test"
-	"github.com/matrix-org/dendrite/test/testrig"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
 	"github.com/stretchr/testify/assert"
 )
 
 func mustCreateFederationDatabase(t *testing.T, dbType test.DBType) (storage.Database, func()) {
-	b, baseClose := testrig.CreateBaseDendrite(t, dbType)
+	caches := caching.NewRistrettoCache(8*1024*1024, time.Hour, false)
 	connStr, dbClose := test.PrepareDBConnectionString(t, dbType)
-	db, err := storage.NewDatabase(b, &config.DatabaseOptions{
+	ctx := context.Background()
+	cm := sqlutil.NewConnectionManager()
+	db, err := storage.NewDatabase(ctx, cm, &config.DatabaseOptions{
 		ConnectionString: config.DataSource(connStr),
-	}, b.Caches, func(server gomatrixserverlib.ServerName) bool { return server == "localhost" })
+	}, caches, func(server gomatrixserverlib.ServerName) bool { return server == "localhost" })
 	if err != nil {
 		t.Fatalf("NewDatabase returned %s", err)
 	}
 	return db, func() {
 		dbClose()
-		baseClose()
 	}
 }