Add support for psycopg2 UNICODEARRAY extension

SQLAlchemy currently enables psycopg2 UNICODE extension when "use_native_unicode" is requested. The UNICODEARRAY extension should be also be included in this case, as in:

dialects/postgresql/psycopg2.py:

        if self.dbapi and self.use_native_unicode:
            def on_connect(conn):
                extensions.register_type(extensions.UNICODE, conn)
                extensions.register_type(extensions.UNICODEARRAY, conn)
            fns.append(on_connect)

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