remote calendar: authenticate to ms graph api

composer.json

@@ -19,6 +19,7 @@
         "graylog2/gelf-php": "^1.5",
         "knplabs/knp-menu-bundle": "^3.0",
         "knplabs/knp-time-bundle": "^1.12",
+        "knpuniversity/oauth2-client-bundle": "^2.10",
         "league/csv": "^9.7.1",
         "nyholm/psr7": "^1.4",
         "ocramius/package-versions": "^1.10 || ^2",
@@ -48,6 +49,7 @@
         "symfony/webpack-encore-bundle": "^1.11",
         "symfony/workflow": "^4.4",
         "symfony/yaml": "^4.4",
+        "thenetworg/oauth2-azure": "^2.0",
         "twig/extra-bundle": "^3.0",
         "twig/intl-extra": "^3.0",
         "twig/markdown-extra": "^3.3",