[blob-service] Support HTTP Range header

Summary:
https://linear.app/comm/issue/ENG-3746/blob-service-support-http-range-header-for-get-blob-handler. Added
support for HTTP Range header. This header is valid with RFC-7233 standard.

Test Plan:
I've run blob service and tested request via Postman. Tested ranges:
bytes=0-1023
bytes=5-
bytes=-10
bytes=0-99999 // Out of range

Reviewers: bartek, michal, tomek, jon

Reviewed By: bartek, michal

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D8367