We currently use a callback syntax for abstract services. This syntax isn't completely strict compliant and will fail the strictPropertyInitialization check. We also currently don't get any compile time errors if we forget to implement a function.
To that end this PR updates all platform owned services to use the appropriate abstract keyword for non implemented functions. I also updated the fields to be actual functions and not properties.
* 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
