feature: add project labels

api/query/label_color.sql

@@ -1,2 +1,9 @@
 -- name: GetLabelColorByID :one
 SELECT * FROM label_color WHERE label_color_id = $1;
+
+-- name: GetLabelColors :many
+SELECT * FROM label_color;
+
+-- name: CreateLabelColor :one
+INSERT INTO label_color (name, color_hex, position) VALUES ($1, $2, $3)
+  RETURNING *;