feat(milestones): add new options to exempt all milestones (#291)

* refactor: move and rename the interfaces/classes

closes #272

* docs: update the readme and action to describe the new options for milestones

* refactor: split the tests into multiple files

* feat(milestones): add new options to exempt all milestones

* test: add coverage for the default values

* test(milestones): add more coverage (wip)

* test(milestones): add more coverage for the multiple exempt milestones

* test: reduce duplicated code

* test: change some describes

* test: add more coverage

* test: add more coverage

* test: add final coverage

* build(tsc): add missing project flag to build with the right tsconfig

* test(milestones): use each to reduce the complexity of the tests

* chore: fix an eslint issue with prettier on windows

the end of line was wrong each time the os process the files

* docs: move the contribution section to a dedicated file

add more content to help the debug

* chore: make sure the rebase is ok

__tests__/functions/generate-issue.ts

@@ -0,0 +1,34 @@
+import {Issue} from '../../src/classes/issue';
+import {IIssuesProcessorOptions} from '../../src/interfaces/issues-processor-options';
+import {IsoDateString} from '../../src/types/iso-date-string';
+
+export function generateIssue(
+  options: IIssuesProcessorOptions,
+  id: number,
+  title: string,
+  updatedAt: IsoDateString,
+  createdAt: IsoDateString = updatedAt,
+  isPullRequest = false,
+  labels: string[] = [],
+  isClosed = false,
+  isLocked = false,
+  milestone: string | undefined = undefined
+): Issue {
+  return new Issue(options, {
+    number: id,
+    labels: labels.map(l => {
+      return {name: l};
+    }),
+    title,
+    created_at: createdAt,
+    updated_at: updatedAt,
+    pull_request: isPullRequest ? {} : null,
+    state: isClosed ? 'closed' : 'open',
+    locked: isLocked,
+    milestone: milestone
+      ? {
+          title: milestone
+        }
+      : undefined
+  });
+}