[enhancement][DSLX] Support ..= inclusive range so pattern matches can use inclusive max value

[cdleary]

What's hard to do? (limit 100 words)

Right now you can't do a pattern easily like: s8:0..s8:127 => with an inclusive maximum value for a type because the 127 is excluded and the type is incapable of expression 128. Rust has ..= to help with this.

Current best alternative workaround (limit 100 words)

Add another pattern to match arm with | like s8:0..s8:127 | s8:127 =>

Your view of the "best case XLS enhancement" (limit 100 words)

We add ..= support to pattern ranges as well.