llama : add DRY sampler (#9702)
* sampling : add DRY sampler (post-refactor)
* DRY: Trying to fix coauthors, removed unneeded line
* DRY: Fixed redundant code
* DRY: Fixed crash issue due to DRY being in chain but uninitialized
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Co-authored-by: l3utterfly <gc.pthzfoldr@gmail.com>
Co-authored-by: pi6am <34464159+pi6am@users.noreply.github.com>
