Remove assemble and assembler module

[ElePT]

Summary

This PR removes the deprecated functionality related to assemble, which includes the following public API components:

  * ``qiskit.compiler.assemble`` function
  * ``qiskit.assembler.assemble_circuits`` function
  * ``qiskit.assembler.assemble_schedules`` function
  * ``qiskit.assembler.disassemble`` function
  * ``qiskit.assembler.RunConfig`` class
  * ``qiskit.circuit.Instruction.assemble`` method

Details and comments

This PR was developed on top of the changes from #13743 and is blocked by it.

[qiskit-bot]

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

• @Qiskit/terra-core

[coveralls]

Pull Request Test Coverage Report for Build 13138529136

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 124 unchanged lines in 13 files lost coverage.
• Overall coverage decreased (-0.2%) to 88.654%

---

Files with Coverage Reduction	New Missed Lines	%
crates/circuit/src/dag_circuit.rs	1	89.36%
crates/accelerate/src/unitary_synthesis.rs	1	92.97%
qiskit/providers/fake_provider/fake_backend.py	1	85.51%
qiskit/circuit/quantumcircuit.py	1	93.63%
qiskit/pulse/transforms/canonicalization.py	1	93.44%
qiskit/pulse/transforms/base_transforms.py	2	86.96%
qiskit/pulse/schedule.py	3	88.6%
crates/qasm2/src/lex.rs	5	92.23%
qiskit/qobj/converters/lo_config.py	6	89.66%
qiskit/qobj/pulse_qobj.py	12	81.01%

Totals
Change from base Build 13135899673:	-0.2%
Covered Lines:	78949
Relevant Lines:	89053

---

💛 - Coveralls

[1ucian0]

on hold until #13743 merges.

[eliarbel]

I've left a few minor reno suggestions but other than those this looks good to me.

[eliarbel]

Thanks for cleaning the world!