Implement unitary AQC

[garrison]

This is very rough (untested so far, but lint passes). It follows the same style as #35, which itself is motivated by the desire that implement both state AQC and unitary AQC alongside one another in this package.

The main thing left to do is to show how to construct the target tensor network. There is a quimb tutorial that does this, but it seems to construct the unitary in dense form first, and we want to avoid this.

[coveralls]

Pull Request Test Coverage Report for Build 12043918223

Details

• 9 of 28 (32.14%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-2.9%) to 95.511%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit_addon_aqc_tensor/simulation/quimb/init.py	4	11	36.36%
qiskit_addon_aqc_tensor/objective.py	5	17	29.41%

Totals
Change from base Build 12043748422:	-2.9%
Covered Lines:	617
Relevant Lines:	646

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💛 - Coveralls