Come-up with an initial working implementation for serialization

[FranciscoThiesen]

Now that we have some examples/benchmarks, we could test serialization + deserialization with the same examples.

My initial aim is for a simple implementation, which we can iterate upon later (perf, complex use-cases, etc)

[lemire]

It should be possible to leverage simdjson for deserialization.

[FranciscoThiesen]

Marking this as done!