* Add `CryptoApi.setDeviceVerified`
I need a way to mark devices as trusted for the backup tests.
* More tests
* Simplify E2EKeyResponder.addDeviceKeys
The user and device IDs are in the test data, so no need to pass them in
* Clean up key backup integration test
Make it use the CryptoApi rather than legacy `MatrixClient.crypto`, and use a
pre-signed backup instead of requiring a "blindlySignAnything" method.
* run megolm-backup tests on both crypto stacks
* avoid internal backupManager
* Return uploaded keys from `/keys/query`
* Basic implementation of SAS verification in Rust
* Update the `verifier` *before* emitting `erificationRequestEvent.Change`
* remove dead code
* Tweaks to the integ test to conform to the spec
Rust is a bit more insistent than legacy crypto...
* Improve documentation on request*Verification
* Check more things in the integration test
* Create an E2EKeyResponder
* Test verification with custom method list
* Add a test for SAS cancellation
* Update spec/integ/crypto/verification.spec.ts
