Add py-pglast 1.1

PostgreSQL Languages AST and statements prettifier

Exposes the parse tree of a PostgreSQL statement (extracted by the almost
standard PG parser repackaged as a standalone static library by libpg_query)
as set of interconnected nodes, usually called an abstract syntax tree.

WWW: https://github.com/lelit/pglast

PR: 234855
Submitted by: Adam Wolk <a.wolk@fudosecurity.com>