Add restic stats command

[DeepikaDixit]

Change Overview

Add Restic stats command to query stats given a snapshot ID

Pull request type

Please check the type of change your PR introduces:

• Work in Progress
• Refactoring (no functional changes, no api changes)
• Trival/Minor
• Bugfix
• Feature
• Documentation

Issues

• Get Restic stats for a given snapshot #258

Test Plan

• Manual
• Unit test
• E2E

Restic Command

$ restic stats 7e17e764
repository c6746ff5 opened successfully, password is correct
found 2 old cache directories in /Users/deepikadixit/Library/Caches/restic, pass --cleanup-cache to remove them
scanning...
Stats for 7e17e764 in restore-size mode:
  Total File Count:   9
        Total Size:   10.322 KiB

[SupriyaKasten]

Looks good to me @DeepikaDixit, are we planning to add unit test in restic_test.go in k10 ?

[DeepikaDixit]

Looks good to me @DeepikaDixit, are we planning to add unit test in restic_test.go in k10 ?

Yes @SupriyaKasten. We have some integration tests there, I will update those