[s2766] Add script support for quest 10988

Thanks @grz3s for providing the necessary data

Please note that the spawns locations and durations for creature entry 22986 and go entry 185541 need to be synced

(based on commit [2955] - c364af1)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[s2767] Allow grid searchers to exclude the source from the actual search

This is useful when searching for a creature with same entry as the source

(based on commit [2957] - 4fbb7ef)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>