bivariate bicycle code using polynomial quotient ring

[Fe-r-oz]

This PR implements bivariate bicycle code using polynomial quotient ring and resolves #596. Three-term, four-term and n-term bivariate polynomials are supported.

[[756, 16, ≤ 34]]

julia> l=21; m=18;
julia> R, (x, y) = polynomial_ring(GF(2), [:x, :y]);
julia> I = ideal(R, [x^l-1, y^m-1]);
julia> S, _ = quo(R, I);
julia> A = S(x^3 + y^10 + y^17);
julia> B = S(y^5 + x^3  + x^19);
julia> c = BivariateBicycleCode(l, m, A, B);
julia> code_n(c), code_k(c)
(756, 16)

[[128, 14, 12]]

julia> l=8; m=8;
julia> R, (x, y) = polynomial_ring(GF(2), [:x, :y]);
julia> I = ideal(R, [x^l-1, y^m-1]);
julia> S, _ = quo(R, I);
julia> A = S(x^2 + y + y^3 + y^4);
julia> B = S(y^2 + x + x^3 + x^4);
julia> c = BivariateBicycleCode(l, m, A, B);
julia> code_n(c), code_k(c)
(128, 14)

• 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

[codecov]

Codecov Report

❌ Patch coverage is 98.14815% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 76.73%. Comparing base (73c133a) to head (5508616).

Files with missing lines	Patch %	Lines
src/ecc/codes/qeccs_using_oscar.jl	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #598      +/-   ##
==========================================
+ Coverage   76.53%   76.73%   +0.20%     
==========================================
  Files         122      123       +1     
  Lines        7491     7545      +54     
==========================================
+ Hits         5733     5790      +57     
+ Misses       1758     1755       -3     

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