[chore] move caches to a separate State{} structure (#1078)

* move caches to a separate State{} structure

Signed-off-by: kim <grufwub@gmail.com>

* fix call to log.Panic not using formatted call

Signed-off-by: kim <grufwub@gmail.com>

* move caches to use interfaces, to make switchouts easier in future

Signed-off-by: kim <grufwub@gmail.com>

* fix rebase issue

Signed-off-by: kim <grufwub@gmail.com>

* improve code comment

Signed-off-by: kim <grufwub@gmail.com>

* fix further issues after rebase

Signed-off-by: kim <grufwub@gmail.com>

* heh

Signed-off-by: kim <grufwub@gmail.com>

* add missing license text

Signed-off-by: kim <grufwub@gmail.com>

Signed-off-by: kim <grufwub@gmail.com>

testrig/db.go

@@ -28,6 +28,7 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/db/bundb"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 	"github.com/superseriousbusiness/gotosocial/internal/log"
+	"github.com/superseriousbusiness/gotosocial/internal/state"
 )
 
 var testModels = []interface{}{
@@ -92,10 +93,16 @@ func NewTestDB() db.DB {
 		})
 	}
 
-	testDB, err := bundb.NewBunDBService(context.Background())
+	var state state.State
+	state.Caches.Init()
+
+	testDB, err := bundb.NewBunDBService(context.Background(), &state)
 	if err != nil {
 		log.Panic(err)
 	}
+
+	state.DB = testDB
+
 	return testDB
 }