Investigate Ways to Reduce Dependence on Reflection for EventSource

[brianrob]

EventSources currently require reflection for both manifest-based logging and tracelogging. The latter is required, because there is no concept of subclasses or event methods - just calls to Write public methods on EventSources.

However, we can do better with manifest-based logging. There is currently an IL transform in the toolchain that triggers for a well-known set of EventSources in the framework and pre-generates metadata for them so that reflection is not used at runtime. We should consider expanding this transform for two cases:

1. Automatically detect reflection blocked types and pre-generate metadata for them, rather than having to explicitly opt the types in.
2. Support localized resources (the current transform does not support this).