Add sortby and rev arguments to eigensolver functions

[albertomercurio]

Checklist

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Description

This PR adds the feature of sorting the eigenvalues for the sparse solver through the keyword arguments sortby and rev. The former is also available for the dense solver case.

Related issues or PRs

Fixes #514

[codecov]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 31.05%. Comparing base (be147e5) to head (dc7444e).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/qobj/eigsolve.jl	0.00%	7 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (be147e5) and HEAD (dc7444e). Click for more details.

HEAD has 5 uploads less than BASE

Flag	BASE (be147e5)	HEAD (dc7444e)
	8	3

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #546       +/-   ##
===========================================
- Coverage   93.15%   31.05%   -62.11%     
===========================================
  Files          51       50        -1     
  Lines        3566     3523       -43     
===========================================
- Hits         3322     1094     -2228     
- Misses        244     2429     +2185     

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[albertomercurio]

The error should not be related to this. I will rerun the tests tomorrow.