feat: add simple multibranch

[katzper-michno]

Resolves #122

Changes

• Changes cli interface: remove --preset flag and instead add -pull-request and -main. Example usage could be setup-ci -pull-request jest ts -main lint ts.
• Extends CycliConfig to Map<WorkflowEvent, Set<CycliWorkflowType>>, which is obtained by ConfigExtension using two multiselect prompts (one for pull request, one for push to main), or provided cli flags.
• Add ExecutorExtension that based on CycliConfig, performs all required actions, which are split into two steps: project configuration and workflow generation
• WorkflowsExtension receives object events: WorkflowEvent[] based on which appropriate on: field in generated workflows is created.

All changes are designed in such a way to make the logic extendable in the direction of adding more supported events.

TODO:

• Update documentation
• Update links to docs
• Adjust help message (use [<workflow1> <workflow2>...] to signalize that -pull-request and -main flags should be proceeded by a list of workflows
• Add unit tests for new cases (new syntax works, but push, or multiple branches do not work)
• Manual testing of less trivial cases in large projects
• More push branches are not handled by recipes
• Adjust analytics (it should work, but potentially not important as union of all features is sent)