feat(exempt): add new options to exempt the milestones (#279)

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

closes #270

* test(milestones): add coverage

* test(issue): add coverage

* chore(rebase): fix all errors due to the rebase

also made some changes regarding the change I made with the lint scripts and prettier. I did not saw that some scripts were already here and I created to more to keep the old ones as well

* test(milestone): add coverage

* chore(index): update index

* fix(checks): remove checks over optional number options

the code was actually handling the case where the values are NaN so it's fine

src/classes/loggers/issue-logger.ts

@@ -0,0 +1,31 @@
+import * as core from '@actions/core';
+import {Issue} from '../issue';
+import {Logger} from './logger';
+
+export class IssueLogger implements Logger {
+  private readonly _issue: Issue;
+
+  constructor(issue: Issue) {
+    this._issue = issue;
+  }
+
+  warning(message: Readonly<string>): void {
+    core.warning(this._prefixWithIssueNumber(message));
+  }
+
+  info(message: Readonly<string>): void {
+    core.info(this._prefixWithIssueNumber(message));
+  }
+
+  error(message: Readonly<string>): void {
+    core.error(this._prefixWithIssueNumber(message));
+  }
+
+  private _prefixWithIssueNumber(message: Readonly<string>): string {
+    return `[#${this._getIssueNumber()}] ${message}`;
+  }
+
+  private _getIssueNumber(): number {
+    return this._issue.number;
+  }
+}