Add @hpke/shake as one of hpke-js extensions. #587
Description
Is your feature request related to a problem? Please describe.
A proposal has been made in the IETF/CFRG to use SHAKE as KDFs for HPKE:
- https://datatracker.ietf.org/doc/draft-irtf-cfrg-concrete-hybrid-kems/
- https://datatracker.ietf.org/doc/draft-ietf-hpke-pq/
Describe the solution you'd like
Implement them as an hpke-js extension named @hpke/shake.
Describe alternatives you've considered
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Additional context
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