Element-R: login-and-verify tranche 3: completion

[richvdh]

Build on #24983 and #25316

• Implement CryptoApi.getVerificationRequestsToDeviceInProgress in RustCrypto. It just calls OlmMachine::get_verification_requests and wraps the results
  Integration test: send an incoming m.key.verification.request and check that getVerificationRequestsToDeviceInProgress returns something useful.
  Estimate: 1d
  Element-R: implement CryptoApi.getVerificationRequestsToDeviceInProgress matrix-org/matrix-js-sdk#3497

• Implement CryptoApi.requestVerificationToDevice in Rust. It calls OlmMachine::get_identity(my_user_id).request_verification and sends the OutgoingVerificationRequest, then wraps the VerificationRequest and returns it.
  After this, the happy-path integration test we wrote in Element-R: login-and-verify tranche 1: groundwork #24983 should pass.
  Estimate: 2d, to get everything working right.
  Element-R: Basic implementation of SAS verification matrix-org/matrix-js-sdk#3490

• In SetupEncryptionStore (in react-sdk), replace:

  • getStoredDevicesForUser -> getCrypto().getUserDeviceInfo
  • getVerificationRequestsToDeviceInProgress
  • requestVerification
    Fix access to deprecated methods in SetupEncryptionStore matrix-org/matrix-react-sdk#11107

  After this, the cypress test we wrote in Element-R: login-and-verify tranche 1: groundwork #24983 should pass.
  Estimate: another 2d? to get it working reliably.

[richvdh]

After this, the cypress test we wrote in #24983 should pass.
Estimate: another 2d? to get it working reliably.

Unfortunately this isn't the case, because the cypress test requires incoming-verification-request support. Edit: this is nonsense.

[richvdh]

This is now working!