Kron dense

[MrRobot2211]

This is the kron_dense implementation.

We should merge it after extra_functions.

[coveralls]

Pull Request Test Coverage Report for Build 1075321134

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 3 of 3 (100.0%) changed or added relevant lines in 2 files are covered.
• 33 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+1.0%) to 83.628%

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Files with Coverage Reduction	New Missed Lines	%
src/qutip_cupy/dense.py	33	81.14%

Totals
Change from base Build 1025096836:	1.0%
Covered Lines:	189
Relevant Lines:	226

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💛 - Coveralls

[hodgestar]

@MrRobot2211 And merge main into this one.