[[4p, 2(p − 2), 4]] Delfosse-Reichardt repetition code

[Fe-r-oz]

The paper Short Shor-style syndrome sequences has many interesting generalized quantum codes from base that could be implemented. This PR implements one such code: [[4p, 2(p − 2), 4]] Delfosse repetition code. This is one of the generalized codes that were developed by Delfosse and Reichardt.

Interestingly, ECC Zoo don't have entries for these 'generalized codes' yet. These codes are tested using the test_ecc_base.jl for properties checkup. These codes were defined as [[4p, 2(p − 2), 4]] codes so I named them DelfosseRepCode. Internally, it uses extended blocks of [4,1,4] repetition code which is different in symmetry/structure from the RepCode that is already implemented.

Please find the following schematics for these codes:

• The code is properly formatted and commented.
• Substantial new functionality is documented within the docs.
• All new functionality is tested.
• All of the automated tests on github pass.
• We recently started enforcing formatting checks. If formatting issues are reported in the new code you have written, please correct them.

[Fe-r-oz]

What's left is to add some explicit tests so that I can verify stuff from this paper explicitly.

[Fe-r-oz]

P̶l̶e̶a̶s̶e̶ h̶e̶l̶p̶ r̶e̶v̶i̶e̶w̶ t̶h̶i̶s̶ P̶R̶, t̶h̶a̶n̶k̶ y̶o̶u̶!̶

Edit: Documentation needs polish and a small doctest is required so turned it to draft 🙏🏼

[Fe-r-oz]

Please help review this PR, thank you!

I updated the documentation, added a docstring that includes [[24,8,4]] Delfosse repetition code.

[Fe-r-oz]

There were some merge conflicts due to the fixes which got resolved thanks to #479.

Please help review this PR, Thank you!

[codecov]

Codecov Report

Attention: Patch coverage is 82.75862% with 5 lines in your changes missing coverage. Please review.

Project coverage is 83.46%. Comparing base (5341f9d) to head (ee49ba4).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/ecc/codes/delfosserepcode.jl	82.75%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #465      +/-   ##
==========================================
- Coverage   83.51%   83.46%   -0.05%     
==========================================
  Files          72       73       +1     
  Lines        4804     4833      +29     
==========================================
+ Hits         4012     4034      +22     
- Misses        792      799       +7     

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