Feature/kapa kafka alert node

[jaredscheib]

Closes #2904
Closes #3385
Closes #3384
Closes #3382

• CHANGELOG.md updated with a link to the PR (not the Issue)
• Rebased/mergeable
• Tests pass
• Update swagger.json

TODO:

• fix kafka alert endpoint retention in rule builder
• ensure field kafka-topic is correct on alert handler
• update swagger

The Problem

• Kafka will be introduced as a node type in Kapacitor 1.5, and we want to include support for it in Chronograf.
• Not all Kapa config errors were being passed through in the error notification successfully.
• Parts of the MeasurementList and all of the FieldList components in the Kapacitor rule builder DataSection were disabled.

The Solution

• Introduce a Kafka config & alert handler.
• Pass through errors successfully, regardless of how many colons they have in the string.
• Fix & refine the logic that governs when MeasurementList and FieldList are disabled.

This PR also converts DataSection to TypeScript, as well as many of its dependencies.