Logging on Service Registration

[hikalkan]

Currently, we can't write logs in ConfigureServices since the dependency injection phase has not been completed and the ILogger can be resolved once dependency injection completed.

We are introducing IInitLogger that can be used in DI registration phase, in ConfigureServices.
When you have IServiceCollection services, you can use services.GetInitLogger() to obtain a reference to the IInitLogger. Then you can write logs like;

var logger = services.GetInitLogger();
logger.Log(LogLevel.Information, "my log message..."); //gets optional `Exception` as the last argument.

Logs are collected in a collection and written to the actual ILogger once the DI registration phase completes and we are able to resolve the ILogger.