Allow delegate profiling

[brendo]

Create a new view that lets developers see what delegates are taking the longest to execute and what extensions are registered for these delegates (and how long they take).

This will be a little conversational, but I think it's more educational than anything else and it will only make things better.

[brendo]

I started work on this in my local forks for those who are curious:

• https://github.com/brendo/profiledevkit/tree/integration
• https://github.com/brendo/symphony-2/tree/delegate-profiling