graph: Add support for "or" filter on /users

This add support for combining filters on the /users with a logical "or" operation.
E.g. the filter:

"filter=(memberOf/any(m:m/id eq 509a9dcd-bb37-4f4f-a01a-19dca27d9cfa) or memberOf/any(m:m/id eq 262982c1-2362-4afa-bfdf-8cbfef64a06e)"

will return all users that are a member of either of the referenced group.

Closes: #5667
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f