feat(deparser): add join fixtures for pretty printing tests #974

Job	Run time
parser-tests (plpgsql-deparser)	1m 9s
parser-tests (pgsql-cli)	56s
parser-tests (plpgsql-parser)	1m 5s
parser-tests (transform)	6m 3s
parser-tests (parser)	51s
parser-tests (deparser)	1m 3s
parser-tests (utils)	1m 1s
parser-tests (traverse)	1m 0s
parser-tests (proto-parser)	58s
	14m 6s

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