Min RK 3130b913fc specify that groups shall be UTF8
group being a `char *` is logically a text type, which needs an encoding.

Declare in the API that groups shall be UTF8-encoded,
matching the `zmq_msg_gets` API, which is the other user-facing `char *` API,
which has the same definition.

This allows bindings to provide text-type APIs,
which they cannot do if arbitrary bytes are allowed
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