[Comm-opaque2] Change project name to avoid name clash

Summary:
Cargo requires the crate name to match the project
name

Part of https://linear.app/comm/issue/ENG-3263

Test Plan:

cd services/identity
cargo build

Reviewers: varun, bartek

Reviewed By: varun, bartek

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D7116