Add support for ES256K

[ycrumeyrolle]

No description provided.

[codecov]

Codecov Report

Merging #494 into master will increase coverage by 0.03%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master     #494      +/-   ##
==========================================
+ Coverage   63.09%   63.13%   +0.03%     
==========================================
  Files         165      165              
  Lines        8772     8785      +13     
  Branches     1448     1449       +1     
==========================================
+ Hits         5535     5546      +11     
- Misses       2718     2721       +3     
+ Partials      519      518       -1     

Impacted Files	Coverage Δ
src/JsonWebToken/CryptographicOperations.cs	100.00% <ø> (ø)
src/JsonWebToken/EllipticalCurves.cs	67.64% <60.00%> (-1.32%)	⬇️
src/JsonWebToken/IntegerMarshal.cs	90.47% <66.66%> (-3.97%)	⬇️
src/JsonWebToken/ECJwk.cs	57.66% <100.00%> (+0.36%)	⬆️
src/JsonWebToken/SignatureAlgorithm.cs	85.81% <100.00%> (+0.52%)	⬆️

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