[FEATURE] Skip hash validation of the backed up files

[rezavaghefi]

Is your feature request related to a problem? Please describe.
The hash validation step of the backup process takes a lot of time when there is too much data. This is also the case for smaller subsequent backups as ESOP validates the hash for all the existing files in s3.

This also makes it impossible/difficult to have backups scheduled with short intervals, i.e. every hour.

Describe the solution you'd like
Having the option to skip the hash validation should resolve this issue.

[smiklosovic]

#82