refactor: add ID field for column

Author: soedirgo

src/lib/interfaces.ts

@@ -85,6 +85,7 @@ export namespace Tables {
     table_id: number
     schema: string
     table: string
+    id: string
     ordinal_position: number
     name: string
     default_value: string | null

src/lib/sql/columns.sql

@@ -3,6 +3,7 @@ SELECT
   c.oid AS table_id,
   table_schema AS schema,
   table_name AS table,
+  (c.oid || '.' || ordinal_position) AS id,
   ordinal_position,
   column_name AS name,
   column_default AS default_value,