Preserve \src attributes through ABC9 synthesis #11

Job	Run time
pre_docs_job	4s
pre_job	6s
Reusable build (ubuntu-latest)	18m 13s
Reusable build (macos-latest)	14m 49s
Try build docs	0s
Run docs tests (ubuntu-latest)	25s
Run test_cell (ubuntu-latest)	1m 28s
Run tests (macos-latest)	10m 12s
Run tests (ubuntu-latest)	8m 16s
	53m 33s

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