refactor(ffi): Make is_room_alias_format_valid
stricter
#4234
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Previously this only used the Ruma checks, which only handled the initial
#
char and the domain part. With these changes, the name part is also validated, checking it's lowercase, with no whitespaces and containing only allowed chars, similar to whatDisplayName::to_room_alias_name
does.Signed-off-by: