Parse transform rewriting native Erlang operators into pg_sql calls.

Activated by including equery/include/equery.hrl in user modules. Inside the lambda arguments of q:where, q:select, q:join, q:join, q:lateral_join, q:having, etc., Erlang operators like =:=, >, andalso, + are rewritten to their SQL equivalents.

transform_fun/1 performs the same rewrite at runtime for funs created via erl_eval — most commonly from the Erlang shell, including remsh to a running production node. This lets you build queries interactively without compile-time setup.