* create key generation service
* replace old key generation service and add references
* use key generation service in key connector service
* use key generation service in send service
* user key generation service in access service
* use key generation service in device trust service
* fix tests
* fix browser
* add createKeyFromMaterial and tests
* create ephemeral key
* fix tests
* rename method and add returns docs
* ignore material in destructure
* modify test
* specify material as key material
* pull out magic strings to properties
* make salt optional and generate if not provided
* fix test
* fix parameters
* update docs to include link to HKDF rfc
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