Add MD5 and/or SHA1 file hashes to FIleMetadata

MD5 and SHA1 file hashes are the industry standard for file checksums. Not providing them on cloud storage API level is big disadvantage. Dropbox still strugling with this feature for many years. (starting from 2016!). All major cloud storage providers implemented this feature.
This will allow to check real file hash and not custom ContentHash. Custom hash calculation prevents seamless integration with other systems without involving custom middleware to download the file and calclulate the file hash.

Add MD5 and/or SHA1 file hash values to FIleMetadata object.

As alternative, the separate API method can be added to fulfill this request.