Show logs for unknown specs to flag any issues of missing types

[sameh-farouk]

When using the processor mapper, any events that have unknown spec versions or event hash will be ignored. However, it's important to note that these instances should be logged to identify any missing type updates. If these updates are missed, it can cause significant issues when the affected data falls out of sync with the chain. Therefore, logging these instances is crucial to avoid any headaches down the line when debugging any weird sync behavior.

[sameh-farouk]

Update:
PR ready for review