Add Support for BitBucket Code Insights

[fabb]

In the latest version, BitBucket added Code Insights, which would be a perfect fit for Danger.
https://confluence.atlassian.com/bitbucketserver/code-insights-959793680.html
It would be nice if Danger could support this.

[fabb]

There is a REST API that can be used:
https://docs.atlassian.com/bitbucket-server/rest/5.15.0-eap1/bitbucket-code-insights-rest.html

[orta]

Yeah, makes sense 👍

[azz]

There's a tutorial here, too: https://developer.atlassian.com/server/bitbucket/tutorials-and-examples/code-insights-tutorial/