Add serialize/deserializePrivatekey to KemInterface.

[dajiaji]

No description provided.

[codecov-commenter]

Codecov Report

Merging #249 (3a65fc0) into main (c335f58) will decrease coverage by 0.68%.
The diff coverage is 78.26%.

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
- Coverage   96.89%   96.22%   -0.68%     
==========================================
  Files          34       35       +1     
  Lines        2515     2597      +82     
  Branches      227      233       +6     
==========================================
+ Hits         2437     2499      +62     
- Misses         77       96      +19     
- Partials        1        2       +1     

Flag	Coverage Δ
unittests	96.22% <78.26%> (-0.68%)	⬇️

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

Files Changed	Coverage Δ
src/interfaces/kemPrimitives.ts	100.00% <ø> (ø)
src/kems/dhkemPrimitives/ec.ts	90.13% <33.33%> (-2.49%)	⬇️
src/kems/dhkemPrimitives/x25519.ts	98.30% <85.71%> (-1.70%)	⬇️
src/kems/dhkemPrimitives/x448.ts	98.33% <88.00%> (-1.67%)	⬇️
src/exporterContext.ts	96.77% <100.00%> (-0.20%)	⬇️
src/kems/dhkem.ts	100.00% <100.00%> (ø)
src/utils/emitNotSupported.ts	100.00% <100.00%> (ø)