graph: Allow using binary LDAP UUIDs as user ids

In Active Directories UUID attributes such as "objectGUID" use a binary
syntax (oposed to the standard UUID syntax defined in RFC4530). This
introduces a flag to enable support for binary UUIDs as the id for users
and groups (similar to what the "users" and "groups" services already
support)

Fixes: #5815
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f