[[8p, 4p − 2, 3]] Delfosse-Reichardt Generalized [[8,2,3]] 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 the fourth such code family: [[8p, 4p − 2, 3]] Delfosse-Reichardt Generalized [[8,2,3]] code. This is one of the generalized codes that were developed by Delfosse and Reichardt.

• The first quantum stabilizer code is implemented in [[4p, 2(p − 2), 4]] Delfosse-Reichardt repetition code #465
• The second and third quantum stabilizer code is implemented as new invention :) in [[8rp, (8r − 2)p − 2m, 4]] Delfosse-Reichardt code #466
• This PR Implement the fourth family codes: [[8p, 4p − 2, 3]] Delfosse-Reichardt Generalized [[8,2,3]] code

Please find the decoder graphs 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.

What's left is to add specific tests for these codes. :)

[Fe-r-oz]

Please help review this PR, Thank you! :)

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.47%. Comparing base (0035c32) to head (bd56cb4).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
src/ecc/codes/smallest_color_code.jl	40.00%	3 Missing ⚠️
...rc/ecc/codes/delfosse_reichardt_generalized_823.jl	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #468      +/-   ##
==========================================
- Coverage   83.48%   83.47%   -0.01%     
==========================================
  Files          72       74       +2     
  Lines        4802     4824      +22     
==========================================
+ Hits         4009     4027      +18     
- Misses        793      797       +4     

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