Refactor get_port to use FNV-1a hash for consistency across platforms

[deanlee]

resolve commaai/openpilot#34031 :

the issue is caused by a port mismatch between the Mac and the device:

Attempting to connect to zmq endpoint: tcp://172.16.0.20:60942
Expected port on the device: 63557

It seems the static int get_port(std::string endpoint) function returns different port values on macOS and Linux, likely due to platform differences in how std::hash behaves.

This pr fixes the issue where the get_port function returns different port values on macOS and Linux due to platform-specific behavior of std::hash. The mismatch in port values causes connection failures in ZMQ. The solution replacesstd::hashwith a custom FNV-1a hash function to ensure consistent port values across platforms, and reducing the risk of collisions.

[pbassut]

Confirmed this works!
Thank you @deanlee for such quick turn around on this one

[sshane]

@deanlee this breaks PlotJuggler streaming, can you make a PR to fix?

[adeebshihadeh]

Just need to rebuild PJ?

[devtekve]

Thanks @deanlee, this makes it easier to derive the same port from other languages!

[pbassut]

yea, confirmed PJ is broken. I wasn't even able to build/run PJ before so unsure if it was caused by this PR.

[devtekve]

I can't stream either. Last commit from OP stream worked I checked was f50ee8a67a283980ca758adca1a4f7ac39206437

On the commit prior to this MR, streaming was working 3e17f86

[devtekve]

Just need to rebuild PJ?

That's what it looks like from looking on https://github.com/commaai/PlotJuggler/blob/5dff41cfd5d046711bdcf255665c816852056beb/plotjuggler_plugins/DataStreamCereal/datastream_cereal.cpp#L79

[pbassut]

Can we confirm that PJ only needs a rebuild for this to be fixed?

[deanlee]

Can we confirm that PJ only needs a rebuild for this to be fixed?

y. make sure to update to the latest master branch of common/PlotJugglere before rebuilding.