* initial implementation of device dehydration

* add dehydrated flag for devices

* add missing dehydration.ts file, add test, add function to schedule dehydration

* add more dehydration utility functions

* stop scheduled dehydration when crypto stops

* bump matrix-crypto-sdk-wasm version, and fix tests

* adding dehydratedDevices member to mock OlmDevice isn't necessary any more

* fix yarn lock file

* more tests

* fix test

* more tests

* fix typo

* fix logic for checking if dehydration supported

* make changes from review

* add missing file

* move setup into another function

* apply changes from review

* implement simpler API

* fix type and move the code to the right spot

* apply suggestions from review

* make sure that cross-signing and secret storage are set up