adds deprecation notice for *_append/prepend_once()

adds ucx_sstrcmp() compare function to utils.h

adds ucx_list_prepend_once() and ucx_list_prepend_once_a()

adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)

adds ucx_buffer_to_sstr() macro

makes sstrcat and sstrnlen scstr_t compatible constsstr

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