BackendV2 additional properties

[gadial]

Summary

The goal of this PR is to extend BackendV2 with additional properties present in BackendV1 and currently missing, to ensure qiskit-experiments can transition to BackendV2 usage. Properties that only make sense in the context of FakeBackendV2 will be added there.

Details and comments

• Support for the control_channels property.

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[coveralls]

Pull Request Test Coverage Report for Build 2789742793

• 8 of 10 (80.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.006%) to 83.992%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit/providers/fake_provider/fake_backend.py	7	9	77.78%

Totals
Change from base Build 2785570863:	0.006%
Covered Lines:	55910
Relevant Lines:	66566

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💛 - Coveralls

[jakelishman]

This appears to have been obsoleted by #8444, but feel free to re-open if I've missed something.