Split errors into `AllocationSite`, `AllocatingRuntimeCall`, and `DynamicDispatch`

[topolarity]

This makes it much easier to understand the three main opponents one will have when trying to eliminate allocations.

This also does a major re-factoring of the allocfunc.jl internals while we're at it.

Example:

[gbaraldi]

Should we call them errors or something else? And maybe we should add an option to the macro so it executes anyway? But prints this as a warning?

[topolarity]

Should we call them errors or something else?

Open to suggestions 🙂

And maybe we should add an option to the macro so it executes anyway? But prints this as a warning?

I'd be open to a warn_only option or similar, yeah

[gbaraldi]

I guess errors are fine. They look like errors, so I guess that sets the expectation

[topolarity]

Time to go public 😎