[dart:html] Add 'creates' type description to JS calls

Closes #43225

JS calls on promises need to include a type description for types
that may be newly live after the call. Since type parameters in a
promise are not parsed, type dictionary for these APIs is updated
to include any possible types created and code gen is changed to
include them in the JS foreign function call.

Change-Id: I8c977e4b33b383093e4091f1be94199b342521b6
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/160781
Reviewed-by: Stephen Adams <[email protected]>
Commit-Queue: Srujan Gaddam <[email protected]>

Author: srujzs