Add command/whitelist service

[xstefank]

Processes the commands from PRs/issues. Runs the CI/whitelisting if necessary.

[lukasburda]

Can I start working on this?

[lukasburda]

Is it still relevant?

[xstefank]

@lukasburda I wouldn't mind splitting the tyr-core functionality into two modules. tyr-core would be just PR checks and a new tyr-ci module would be for whitelisting. Do you want to try this?

[lukasburda]

@xstefank maybe it would be better to separate the whitelisting from TemplateChecker class and create quarkus module where you start only the whitelist service. Maybe then Issue #119 would not be relevant because tyr-webhook will be just for checks. What do you think?

[xstefank]

@lukasburda it's a good idea but don't create a new module, you can expose the whitelisting in the tyr-webhook for now. If there will be a requirement for a CLI then we will create a new module.