What needs to be done?

Currently src/lib/pg-query/src/Flow/PgQuery/Parser.php returns src/lib/pg-query/src/Flow/PgQuery/Protobuf/AST/ParseResult.php
which is not great since it's a protobuf auto generated.

For now I would like this api to allow user to:

• list all tables in the query
• list all columns in the query for given table
• list all functions in the query
• return raw ParseResult through raw() : ParseResult method

(more features will come)