WIP: Add Elastic exporter

[papey]

Context

This PR adds Elastic search as a new exporter for Scaphandre. Linked to #92.

[uggla]

A couple of advice, I think you should work with the dev branch. Because there are a lot of changes coming up with this release, it will later ease your rebase. Although I don't know when @bpetit plan to release it.
Take care #234 will bring clap 4. And the way to declare command line arguments will change. So I think you can temporary get the #234 commits for your development and remove them as soon as they will be merged. (assuming they will be merged).

[papey]

A couple of advice, I think you should work with the dev branch. Because there are a lot of changes coming up with this release, it will later ease your rebase. Although I don't know when @bpetit plan to release it. Take care #234 will bring clap 4. And the way to declare command line arguments will change. So I think you can temporary get the #234 commits for your development and remove them as soon as they will be merged. (assuming they will be merged).

Thanks for the early feedback, I will rebase my branch against dev, and set dev as target branch for this PR.

I will also look for clap 4 stuff early since you will probably merge your PR before mine. 👍

[papey]

I will watch for main > dev sync in order to remove the non-related commits.

[papey]

👋 everyone, hope you are doing well. I finally have time to work on this PR 🤞 !

Here is some basic stuff, with all the internal Scaphandre metrics. I'll probably rename it a bit.

Here is, IMO, the next steps :

• Rework a bit the naming for scaphandre "self" data
• Add an index for the sockets part, push the socket data
• Add an index for the procs part, push the procs data

After that it should be ready for review !