[FEAT] Ability to configure slack message channel routing

[DanHatesNumbers]

Is your feature request related to a problem? Please describe.
As a Kiln user
I want to be able to send Slack notifications to specific channels based on the application they relate to
So that I can see the specific information I'm interested in

Describe the solution you'd like
Some way of configuring a mapping of application names to slack channel IDs.

Additional context
Add any other context or screenshots about the feature request here.

[DanHatesNumbers]

One option would be to have the CLI include the configured Slack channel from kiln.toml in the ToolReport payload, have the Data-collector publish this information to another Kafka topic if the run if from CI (To prevent data races with local modifications), then have the Slack connector maintain a list of triples for project-branch-channel. The kafka topic could use the first two elements as the message key and use topic compaction to speed up startup.

This approach avoids coupling the Slack connector config to the tool report structure and having to also couple it to the Dependency Events or any other finding events.