High performance file server using `ouroboros-network-framework`

Implement a high performance file server which reads ranges from files and
sends them over the network - mimicking the architecture of
`ouroboros-consensus` storage layer, but not using it. This way we can
measure:

* performance of the networking stack
* provide the lower bound for `ouroboros-consensus`

This will be useful for investigation of performance bottlenecks and making
a base measurments for `ouroboros-network` operating with `ouroboros-consensus`.

Possible performance improvments in the networking code:

* [ ] avoid reading mux headers in a seprate *syscall*
* [ ] avoid using `Binary` encoding for mux segments