Core: Initialize pthread_key duda_logger_fmt_cache
Core: Initialize pthread_key duda_logger_fmt_cache

This pthread key was not initialized, generating a corruption on
Jemalloc when exiting the threads.

Signed-off-by: Eduardo Silva <81f705dc2ce1a61a2621e0e4b442a9474e1d0c70@monkey.io>

monkey/duda,monkey/duda