Add isValidRecoveryKey
Add isValidRecoveryKey

Add method to check if a given string is a valid recovery key

krombel/matrix-js-sdk,matrix-org/matrix-js-sdk,krombel/matrix-js-sdk,matrix-org/matrix-js-sdk,krombel/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk