detect: add ldap.responses.result_code

detect: add ldap.responses.result_code

ldap.responses.result_code matches on LDAP result code
This keyword maps the following eve fields:
ldap.responses[].bind_response.result_code
ldap.responses[].search_result_done.result_code
ldap.responses[].modify_response.result_code
ldap.responses[].add_response.result_code
ldap.responses[].del_response.result_code
ldap.responses[].mod_dn_response.result_code
ldap.responses[].compare_response.result_code
ldap.responses[].extended_response.result_code
It is an unsigned 32-bit integer
Doesn't support prefiltering

Ticket: #7532