Summary:
When shouldEnableLoggingForRequestUrl is false, ImageTelemetry is not initialized, and no logging is done.
* Replace `- (NSString *)loaderModuleNameForRequestUrl:(NSURL *)url` with `- (BOOL)shouldEnableLoggingForRequestUrl:(NSURL *)url`
* Rename RCTImageLoaderInstrumentableProtocol.h -> RCTImageLoaderLoggableProtocol.h
Reviewed By: fkgozali
Differential Revision: D24523984
fbshipit-source-id: a5463eceea1c40f9452b0ad2ee6bf047f71a02c1
Paige Sun