aurel/hawk-main: Start HNSW MPC node

[naure]

• Create the main node program and a test of it.
• This is mostly based on the test code starting at Aby3Store::shared_random_setup_with_grpc

Test with cargo test -p iris-mpc-cpu -- hawk_main --nocapture

Or:

cargo run -p iris-mpc-cpu --bin hawk_main -- --party-index=0 &
cargo run -p iris-mpc-cpu --bin hawk_main -- --party-index=1 &
cargo run -p iris-mpc-cpu --bin hawk_main -- --party-index=2

[iliailia]

Nice! ;)

[iliailia]

Shall it return Err perhaps?

[iliailia]

I think if you add more async tests, then these ports will be congested. So I'd add addresses/ports to HawkArgs and use this func to generate them for tests.