search: Support searching for partition UUID with --part-uuid

[Dmitry]

Hello,

Please review and accept a patch from attachments.
The changes are similar to the next commits in the upstream (--part-uuid for probe cmd):
https://git.savannah.gnu.org/cgit/grub.git/patch/?id=f2b9083f859c7dbf44a7a8e96ee0cf202f9a4187
https://git.savannah.gnu.org/cgit/grub.git/patch/?id=c7cb11b2198a07098143ecc67b19497ba25df28f

Usage:
search -p "${partuuid}" -s my_dev
or
search --part-uuid "${partuuid}" -s my_dev

Thanks,

Dmitry

0001-search-Support-searching-for-partition-UUID-with-par.patch
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