[Backup] Add logging to blob_client

Summary:
Add logging crates to backup. This will allow for tracing commands
to work.

Part of https://linear.app/comm/issue/ENG-1717

Test Plan: Backup CI gate

Reviewers: atul, ashoat, varun, tomek, max, karol

Reviewed By: atul, ashoat, tomek, max, karol

Subscribers: abosh

Differential Revision: https://phab.comm.dev/D5123