feat: add markdown_json output format for unstructured document parsing #4502

Job	Run time
Get Changes	3s
Check: source-shopify	5m 13s
Check: source-pokeapi	2m 6s
Check: destination-motherduck	3m 18s
Check: source-hardcoded-records	2m 54s
Check: source-intercom	4m 40s
Check: source-google-drive	4m 1s
	22m 15s

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