Write prebuffered data

[jorblancoa]

Create a new API call to provide a writting mechanism given a prebuffered data and the number of steps in the buffer.

[sergiorg-hpc]

[Minor] You could also use standard errno values:
https://man7.org/linux/man-pages/man3/errno.3.html

[sergiorg-hpc]

Looks good! Just minor comments here and there, mostly out of curiosity.

[pramodk]

As this is draft and needs to be discussed in the context of coreneuron + gpu integration aspects, I will review this after coreneuron discussion.
@jorblancoa : I think it will be helpful to have a brief discussion / provide summary of how existing reporting works (implementation aspects) in coreneuron+libsonatareport execution. This will give a better clarity to @olupton @iomaganaris @sergiorg-hpc.