feat/refactoring: sync simple query with new API

pgproto/src/client.rs

pgproto/src/client/simple_query.rs

pgproto/src/entrypoints.rs

pgproto/src/lib.rs

pgproto/src/sql.rs

pgproto/src/sql/handle.rs

pgproto/src/sql/portal.rs

pgproto/src/sql/statement.rs

pgproto/src/storage.rs

pgproto/src/storage/describe.rs

pgproto/src/storage/result.rs

pgproto/src/storage/value.rs