Additional Diagnostics in Dependency Injection (#56809)

Additional Diagnostics in Dependency Injection (#56809)

* Additional Diagnostics in Dependency Injection

Log events when a ServiceProvider is created:

* How many singleton, scoped, transient services?
* Log the list of registrations

Fix #56313

* Add ServiceProvider HashCode to all events.

* Write ServiceProvider information when DependencyInjectionEventSource becomes enabled.

This allows for listeners to attach to a process after it is running, and get the DI information.

* Update new events to use Informational level and to have a Keyword.

* Switch to use WeakReference when holding on to ServiceProviders in DependencyInjectionEventSource.