ScreenSpaceEventHandler has incomplete JSDoc/TypeScript definitions

As reported in #8927, `ScreenSpaceEventHandler` actions have no documentation or TypeScript definitions regarding the signature of the callback function that is called. I think we just need to go through all of the xxxEvent properties locally defined in `ScreenSpaceEventHandler` and properly document/expose them (which will then get picked up by TypeScript).

As part of this, it would probably be good to look at the TS `ScreenSpaceEventHandler` type definition we generate and make sure there are no other similar issues and that what we define is as specific as possible.

Start with the locally defined xxxEvent properties on ScreenSpaceEventHandler and inspect the generated TypeScript ScreenSpaceEventHandler type definition. Compare each callback signature with the available behavior, then verify that the generated definitions expose specific signatures for all relevant events.

Written by the indexing model from the issue text.