Autorest should support creating properties with 'ulong'

[DeepakRajendranMsft]

Autorest should support creating properties with 'ulong' @lamchester @markcowl

[olydis]

Proposal

ulong

type: integer
format: int64
minimum: 0 # or greater

uint

type: integer
format: int32 # optional, since int32 is default
minimum: 0 # or greater

[olydis]

Deferring this since it seems we have not supported this in the past. However, the feature makes sense so should consider it in the future. Now, I'd be cautious since implementing this can cause breaking changes.

For 2.0 generators, this is an interesting case for LL vs HL representation: note that the LL value set must be a superset of the HL value set.

[olydis]

see #2448