Allow exceptions to be manually reported to Pulse

[timacdonald]

When using the exception handlers reportable method, a closure can return false to indicate that the exception has been handled and does not need to "bubble up" to other handlers.

We do this in Forge, for example, to only log errors to our error tracker or the application logs, but not both.

This introduces a manual mechanism to report exceptions to Pulse manually.

Pulse::report($exception);

I've used events here so that other recorders can also listen for the reporting of exceptions.