Multiple small fixes

[Theo-Reignier]

Purpose

Fixing some minor bugs, improving some UI & code logic. Added a 'Histogram' output node.

Changes

• Setting 0 classical bits or 0 classical registers does not allow to process the circuit with Qiskit (no output). Therefore, I set the minimum value to 1. https://github.com/node-red-quantum/node-red-contrib-quantum/pull/113/commits/457712aa6eac774610041e8a4fa6b7eccaef448a
• The script node was a developer's feature (not waiting for all qubits to execute). It is now updated and ready for final release. https://github.com/node-red-quantum/node-red-contrib-quantum/pull/113/commits/ca939364287f738846a99375f035dceb07154732
• Added labels for output ports of output nodes. https://github.com/node-red-quantum/node-red-contrib-quantum/pull/113/commits/fe923b547e9167005632a56aac1044c6197b5b03
• New node 'Histogram Simulator' that simulates the circuit output (QASM local simulator) and generates a base 64 representation of the histogram representing the 'counts'. https://github.com/node-red-quantum/node-red-contrib-quantum/pull/113/commits/d55667cd80d0d859f30e14bbb8e5fd88edd9d483 https://github.com/node-red-quantum/node-red-contrib-quantum/pull/113/commits/d4eb5354eb8dc529a6ea7efeda39e3cb4b803deb
• Minimum nb of shots should be 1 (shots = 0 raises errors) in 'IBM Quantum', 'Local Simulator' & 'Histogram'. https://github.com/node-red-quantum/node-red-contrib-quantum/pull/113/commits/2272d0126a639fdc06eecc91344ede77ecbce9f2 https://github.com/node-red-quantum/node-red-contrib-quantum/pull/113/commits/a8648fb3c3b2243f37e0ae2d54b297783bea0e83
• Updated quantum algorithm nodes' labels for consistency in capital letters. https://github.com/node-red-quantum/node-red-contrib-quantum/pull/113/commits/6b00f31c79b10d4ac2e26733289d492a71a48afc

New Requirements

• @louislefevre, @KhesimReid, @ttoktassynov, I believe the 'quantum circuit' node tests should be modified to NOT accept 0 classical bits or 0 classical registers, maybe same for 'shots' variable?