Add qubits and clbits to dag in `DAGCircuit::with_capacity`

[ElePT]

Summary

Follow-up to #13002 that adds qubits and clbits to the dag when num_qubits or num_clbits are non-zero. This would enable, for example, directly appending instructions using an iterator (https://github.com/Qiskit/qiskit/pull/13032) after creating a new rust DAGCircuit. The alternative is making users add the qubits/clbits manually.

I don't think this is 100% necessary but it definitely increases the usability of with_capacity, in fact, this is how it's done in CircuitData (L238-251).

Details and comments

[qiskit-bot]

One or more of the following people are relevant to this code:

• @Qiskit/terra-core
• @kevinhartman
• @mtreinish

[ElePT]

Closing after internal discussion.