feat(api): add OIDC session service (#6157)

This PR starts the OIDC implementation for the API V2 including the Implicit and Code Flow.


Co-authored-by: Livio Spring <livio.a@gmail.com>
Co-authored-by: Tim Möhlmann <tim+github@zitadel.com>
Co-authored-by: Stefan Benz <46600784+stebenz@users.noreply.github.com>

docs/sidebars.js

@@ -484,6 +484,20 @@ module.exports = {
           },
           items: require("./docs/apis/resources/session_service/sidebar.js"),
         },
+        {
+          type: "category",
+          label: "OIDC lifecycle (Alpha)",
+          link: {
+            type: "generated-index",
+            title: "OIDC service API (Alpha)",
+            slug: "/apis/resources/oidc_service",
+            description:
+              "Get OIDC Auth Request details and create callback URLs.\n"+
+              "\n"+
+              "This project is in alpha state. It can AND will continue breaking until the services provide the same functionality as the current login.",
+          },
+          items: require("./docs/apis/resources/oidc_service/sidebar.js"),
+        },
         {
           type: "category",
           label: "Settings lifecycle (alpha)",