Add JTW to HTTPClient with AzureServiceTokenProvider

AzureServiceTokenProvider_StartUp.cs

services.AddHttpClient(WeatherApiHttpClientName, (provider, httpClient) =>
{
    var appSettings = provider.GetService<IOptions<AppSettings>>().Value;
    
    var azureServiceTokenProvider = new AzureServiceTokenProvider();
    var accessToken = azureServiceTokenProvider.GetAccessTokenAsync(appSettings.AdAppId)
        .ConfigureAwait(false)
        .GetAwaiter()
        .GetResult();

    httpClient.DefaultRequestHeaders.Add("Authorization", $"Bearer {accessToken}");
});