Azure Kusto Output Plugin Docs

[papigers]

Documentation for the new Kusto output plugin

[papigers]

@patrick-stephens just a reminder now that the plugin PR is merged :)

[patrick-stephens]

Yeah, we cannot merge docs until the release though - otherwise it confuses people when they see docs for something only on a master build.

[patrick-stephens]

@lecaros not sure how we tag waiting for release or should this merge to master in advance of 2.0?

[lecaros]

We'll be branching by EOW. After that, all the PRs will go to 2.0 only. Meanwhile, you can tag them using the label 2.0. Thanks!

[lecaros]

Thanks @papigers! I've merged the changes.