gsino

Hello. In the GoogleApi repository, an implementation of `Google.Apis.Http.IHttpClientFactory` using `Microsoft.Extensions.Http.IHttpMessageHandlerFactory` is presented. https://github.com/googleapis/google-api-dotnet-client/issues/1756 https://github.com/googleapis/google-api-dotnet-client/blob/bfc9090dc2fae5b06a654328c4da7bc6b05b66f1/Src/Support/IntegrationTests/HttpClientFromMessageHandlerFactoryTests.cs#L38 To apply this method to Firebase as well, change the type of the `AppOptions.HttpClientFactory` property...