fix(declarative): Pass `extra_fields` in `global_substream_cursor` #915

Job	Run time
Get Changes	3s
Check: 'source-hardcoded-records' (skip=false)	4m 14s
Check: 'source-shopify' (skip=false)	6m 54s
Check: 'destination-motherduck' (skip=true)	2s
Check: 'source-the-guardian-api' (skip=false)	3m 1s
Check: 'source-pokeapi' (skip=false)	2m 46s
	17m 0s

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