Add DHKEM(P-256, HKDF-SHA256) to Seno supported KEMs.

[dajiaji]

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[codecov-commenter]

Codecov Report

Merging #78 (45ee28c) into main (d319cf8) will increase coverage by 2.00%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
+ Coverage   92.47%   94.48%   +2.00%     
==========================================
  Files          20       20              
  Lines        1847     1848       +1     
  Branches      181      196      +15     
==========================================
+ Hits         1708     1746      +38     
+ Misses        139      102      -37     

Flag	Coverage Δ
unittests	94.48% <66.66%> (+2.00%)	⬆️

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Impacted Files	Coverage Δ
src/cipherSuite.ts	100.00% <ø> (ø)
src/kemPrimitives/ec.ts	75.47% <66.66%> (+10.09%)	⬆️
src/kemPrimitives/x25519.ts	97.24% <0.00%> (+1.83%)	⬆️
src/recipientContext.ts	93.75% <0.00%> (+3.12%)	⬆️
src/kemContext.ts	98.42% <0.00%> (+4.21%)	⬆️

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