slicec Does not Reject Tagged Streamed Parameters #823

Tags are all about adding and removing parameters/fields while maintaining on-the-wire compatibility.
Steamed parameters can always be added/removed without affecting on-the-wire compatibility.

Therefore tagging a streamed parameter never makes sense to do. It's not necessary, and streams use their own encoding, distinct from tags anyways.

slicec should of been rejecting these from the get-go, and the fact it allows tag(6) g: stream int32? at all is an oversight.

What's Changed

slicec now rejects tags on streamed parameters with an error.