Add importKey to CipherSuite.

[dajiaji]

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[codecov-commenter]

Codecov Report

Merging #46 (e583f45) into main (eec6834) will decrease coverage by 0.47%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##             main      #46      +/-   ##
==========================================
- Coverage   96.95%   96.48%   -0.48%     
==========================================
  Files          18       18              
  Lines         624      654      +30     
  Branches       70       78       +8     
==========================================
+ Hits          605      631      +26     
- Misses         19       23       +4     

Flag	Coverage Δ
unittests	96.48% <85.71%> (-0.48%)	⬇️

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

Impacted Files	Coverage Δ
src/kemPrimitives/x25519.ts	95.74% <80.00%> (-4.26%)	⬇️
src/kemPrimitives/ec.ts	94.93% <84.21%> (-1.94%)	⬇️
src/cipherSuite.ts	100.00% <100.00%> (ø)
src/kemContext.ts	98.80% <100.00%> (+0.04%)	⬆️

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