meta: utilize dynamic code analysis platforms

[achrinza]

Utilize platforms such as LGTM, CODEBEAT, Guardrails and/or Codacy to provide dynamic code analysis on the project. This can help find issues in the codebase via commit checks and is free for FOSS projects.

These checks tend to take less time than the Travis pipelines hence it won't increase friction to creating and merging PRs

This can mitigate issues from being introduced into the codebase and spot existing issues.

[achrinza]

GitHub code scanning has reached general availability and can be used in place of Semmle LGTM.