[blob] Move HTTP request/response types to comm-lib

Summary:
These types can (and generally should) be shared with the BlobServiceClient living in the comm-lib.
Unified them with types existing in comm-lib so request and response structs are now shared between client and server

Depends on D13616

Test Plan: cargo check

Reviewers: kamil, varun, will

Reviewed By: kamil

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13617