feat: string-unpack api

sqlc.yaml

@@ -0,0 +1,14 @@
+version: "2"
+sql:
+- engine: "postgresql"
+  queries: "string-unpack/internal/sql/"
+  schema: "string-unpack/internal/db/schema.sql"
+  gen:
+    go:
+      out: "string-unpack/internal/sql"
+      sql_package: "pgx/v5"
+      emit_db_tags: true
+      emit_interface: true
+      emit_json_tags: true
+      emit_methods_with_db_argument: false
+      query_parameter_limit: 0