feat: Add new tag types

- Contributor
- Unknown

pkg/database/migrations/007_additional_tag_types.sql

@@ -0,0 +1,4 @@
+-- +migrate Up
+
+INSERT INTO tag_types (name) VALUES ('Contributor');
+INSERT INTO tag_types (name) VALUES ('Unknown');

pkg/models/const.go

@@ -52,6 +52,8 @@ const (
 	Meta           TagType = "meta"
 	Invalid        TagType = "invalid"
 	Copyright      TagType = "copyright"
+	Contributor    TagType = "Contributor"
+	UnknownTagType TagType = "Unknown"
 )
 
 const (