Interface with non-FPGA hosts

[quetric]

To have FPGAs talk to non-FPGA hosts we need a software implementation of the ACCL collectives protocol on top of TCP initially, then on top of RDMA.

[DanieleParravicini]

we can do it preserving the same sw interface for the driver so that we will be able to test it without changing too much code
The first thing to do is to create a send with the same message structure and then build on top of that.
We can probably reuse initial cclo colelctives based on send/recv/accumulate to implement this