Add MessagePack item serializer and validator

[jarmuszz]

This pull request brings serialization and validation to the msgpack.low module.

Serialization is provided for the outside use through tobinary: Pipe[F, MsgpackItem, Byte] and toNonValidatedBinary: Pipe[F, MsgpackItem, Byte] functions. Akin to how the cbor.low serialization is constructed, serialization without validation can potentialy produce malformed data.

Validation API is also exposed through validated: Pipe[F, MsgpackItem, MsgpackItem].

[jarmuszz]

The initial concept of having two serializers was dropped as they ran at a nearly identical time :smiley:.

These are the current benchmarks on i7-8550U:

Benchmark                                       Mode  Cnt     Score    Error  Units
MsgPackItemSerializerBenchmarks.serialize       avgt   10  3337.518 ± 39.333  us/op
MsgPackItemSerializerBenchmarks.withValidation  avgt   10  5107.575 ± 65.148  us/op

Validation seems to slow things down a bit and I think that maybe it is possible to make it a little faster.

[satabin]

Thanks a ton for this new contribution. I had a first look at it and left a few comments. But it looks great already. :clap:

[satabin]

Hi @jarmuszz. I am not sure anymore what the state of this PR is. Is it ready to be re-reviewed or do you still want to address some comments or improvements?

[jarmuszz]

Hi @satabin, Sorry for the confusion and a late reply.

I'll try to address these comments this weekend. I've been trying to combine work with full-time studies which turned out to be more time sinking than I imagined :smiley:. I hope that in the following weeks I'll be working on the fs2-data-msgpack project in a more regular fashion since I'm resigning from the job.

[satabin]

Hi @jarmuszz. Sorry I am replying late again. What is the state of this PR? Do you still plan on working on some parts? Or is it ready to be merged when approved?

[jarmuszz]

Hi, I think it is ready to be merged if approved.