Add support for XTC and DRY samplers

[zpin]

Seems to work, but someone who knows this project better please check the order in apply_func().

[oobabooga]

This is a nice addition, as those parameters are present in llama.cpp but missing in the bindings. @abetlen

[SubatomicPlanets]

I would also love to see this merged!

[etemiz]

Patiently waiting for the merge

[zpin]

Updated for llama.cpp changes

[zpin]

The sampler order was wrong, causing crashes when using XTC. Fixed now.

[JustANyanCat]

Hi, should dry_range be changed to dry_penalty_last_n to match llama.cpp?

Also, should the default value be changed from 0 to -1?
From llama.cpp/examples/main/README.md
--dry-penalty-last-n N: Set DRY penalty for the last n tokens (default: -1, 0 = disable, -1 = context size).