feat(format): implement PL/pgSQL body formatting

* add formatBody and formatBodyInner functions for DECLARE section
* update needSpace to handle LBracket correctly
* enhance semanticallyEqual to compare dollar-quoted bodies
* add test data for broken layout scenarios

testdata/corpus/test_a.pgsql

@@ -54,7 +54,7 @@ BEGIN
     ,encode(digest(format('%s',p_data->>'password'), 'md5'), 'hex')
     ]::citext[];
 
-  if m_allow_hash_auth 
+  if m_allow_hash_auth
   then
     m_pass_hashed := m_pass_hashed || array[
       p_data->>'password'