Add openidconnect authentication demo (#1500)

* Add openidconnect authentication demo

* use_atom_ref usage to have a read/write handle on the atom

* Use default

* Code rewrite to better reflect the authentication flow

* Use the env macro instead of the build.rs to load env variables

* Add env variables

* Remove unnecessary dependency

* Add env variables to the root workspace

* Update readme

* Bump openidconnect version

* Use props to pass the client to the child components

* Code clean up

---------

Co-authored-by: Truong Tan Dat <truongt@igbmc.fr>

examples/openid_connect_demo/src/errors.rs

@@ -0,0 +1,20 @@
+use openidconnect::{core::CoreErrorResponseType, url, RequestTokenError, StandardErrorResponse};
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum Error {
+    #[error("Discovery error: {0}")]
+    OpenIdConnect(
+        #[from] openidconnect::DiscoveryError<openidconnect::reqwest::Error<reqwest::Error>>,
+    ),
+    #[error("Parsing error: {0}")]
+    Parse(#[from] url::ParseError),
+    #[error("Request token error: {0}")]
+    RequestToken(
+        #[from]
+        RequestTokenError<
+            openidconnect::reqwest::Error<reqwest::Error>,
+            StandardErrorResponse<CoreErrorResponseType>,
+        >,
+    ),
+}