* Fix `CryptoStore.countEndToEndSessions`
This was apparently never tested, and was implemented incorrectly.
* Add `CryptoStore.countEndToEndInboundGroupSessions`
* Emit events to indicate migration progress
* Use a `StoreHandle` to init OlmMachine
This will be faster if we need to prepare the store.
* Include "needsBackup" flag in inbound group session batches
* On startup, import data from libolm cryptostore
* ISessionExtended -> SessionExtended
* Element-R: use the pickleKey to encrypt the crypto store
`pickleKey` is a passphrase set by the application for this express purpose.
* update tests
* fix tests, again
* Move existing crypto integ tests into a subdirectory
* Factor out some common bits from `crypto.spec.ts`
* Integration test for device verification
* Ignore generated file in prettier
