Refine KEM interface.

[dajiaji]

Closes #109

[codecov-commenter]

Codecov Report

Merging #116 (13f6154) into main (12b2e8c) will increase coverage by 0.19%.
The diff coverage is 98.42%.

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
+ Coverage   96.26%   96.45%   +0.19%     
==========================================
  Files          19       19              
  Lines        2113     2146      +33     
  Branches      200      195       -5     
==========================================
+ Hits         2034     2070      +36     
+ Misses         79       76       -3     

Flag	Coverage Δ
unittests	96.45% <98.42%> (+0.19%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/cipherSuite.ts	99.49% <93.33%> (+0.82%)	⬆️
src/kems/dhkem.ts	100.00% <100.00%> (ø)
src/kems/dhkemPrimitives/ec.ts	86.53% <100.00%> (ø)
src/kems/dhkemPrimitives/x25519.ts	97.16% <100.00%> (ø)
src/kems/dhkemPrimitives/x448.ts	97.16% <100.00%> (ø)

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