Initialise jq_state->input_cb{,_data} to NULL in jq_init()

To avoid causing segmentation faults when  input/1  is called in a
jq_state on which  jq_set_input_cb()  has not been called; e.g. the one
used by  jq --run-tests.

That segfault could also be fixed in run_jq_tests() by calling:

  jq_set_input_cb(jq, NULL, NULL);

But I think it makes sense to just make jq_init() initialise those
values to NULL.

Ref: https://github.com/jqlang/jq/pull/2717#discussion_r1264338841

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