Implement error_tracking API
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There is currently no support for managing the Sentry integration via the `error_tracking` API https://docs.gitlab.com/ee/api/error_tracking.html. Seems pretty easy to add, though.
## Implementation Guide
- Read the `CONTRIBUTING.md` guide to set up your local development environment and clone the community fork on this project.
- Update the ruby startup script to use the built-in sentry instead of requiring an external sentry, which will be required for testing the terraform resource
- Create the terraform resource itself + tests following the `docs/development/CreatingANewResource.md` guide.
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