Add audit entry of specific subject in group members tab

When investigating out when a particular subject was added to a group, getting the whole audit list for the group and looking through all the pages for the subject is cumbersome. (1) The audit entry table can be very large, and may perform poorly; (2) except for date, there is no filter in the audit entry view other than by date, so the user needs to scan through pages of entries to find the target.

From the membership view, getting the membership add/change/delete audit entries for a particular user in a group should be much faster than getting all the entries for the group.

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