feat: add markdown_json output format for unstructured document parsing #4501

Job	Run time
Get Changes	6s
Check: source-hardcoded-records	3m 5s
Check: source-pokeapi	2m 3s
Check: source-google-drive	3m 35s
Check: source-intercom	3m 35s
Check: source-shopify	3m 35s
Check: destination-motherduck	3m 32s
	19m 31s

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