Refresh access token automatically

[simon-wacker]

Detect expired tokens and attempt token refresh as in the OpenIddict sample app: https://github.com/openiddict/openiddict-samples/pull/332/files and https://github.com/openiddict/openiddict-core/pull/2331/files (these pull requests refer to the issues openiddict/openiddict-core#2157 and openiddict/openiddict-core#2330).

In particular, see https://github.com/openiddict/openiddict-samples/blob/dev/samples/Dantooine/Dantooine.WebAssembly.Server/Startup.cs#L153-L222 and https://github.com/openiddict/openiddict-samples/blob/dev/samples/Dantooine/Dantooine.WebAssembly.Server/Helpers/TokenRefreshingDelegatingHandler.cs

See also https://github.com/openiddict/openiddict-core/blob/b33dad15f37ccfc4228217efdd4fa84f54e4d9e4/sandbox/OpenIddict.Sandbox.AspNetCore.Client/Controllers/HomeController.cs#L61 and

Implementing these changes should also fix the issue of automatically getting logged-out after a few minutes when using the frontend.

[simon-wacker]

Resolved in 4fd1510