Use go embed to load queries from static files (#607)

pkg/statements/sql/table_indexes.sql

@@ -0,0 +1,9 @@
+SELECT
+  indexname AS index_name,
+  pg_size_pretty(pg_table_size((schemaname || '.' || indexname)::regclass)) AS index_size,
+  indexdef AS index_definition
+FROM
+  pg_indexes
+WHERE
+  schemaname = $1
+  AND tablename = $2