feat(draft-pr): add new option to not process PRs which are in draft (#539)

* chore(assignees): add logs

* feat(draft-pr): add new option to not process PRs which are in draft

* refactor(draft-pr): create a dedicated class to handle the logic

* chore(index): update index file

__tests__/constants/default-processor-options.ts

@@ -49,5 +49,6 @@ export const DefaultProcessorOptions: IIssuesProcessorOptions = Object.freeze({
   labelsToAddWhenUnstale: '',
   ignoreUpdates: false,
   ignoreIssueUpdates: undefined,
-  ignorePrUpdates: undefined
+  ignorePrUpdates: undefined,
+  exemptDraftPr: false
 });