* Decrypt and Import full backups in chunk with progress
* backup chunk decryption jsdoc
* Review: fix capitalization
* review: better var name
* review: fix better iterate on object
* review: extract utility function
* review: Improve test, ensure mock calls
* review: Add more test for decryption or import failures
* Review: fix typo
Co-authored-by: Andy Balaam <andy.balaam@matrix.org>
---------
Co-authored-by: Andy Balaam <andy.balaam@matrix.org>