Config v3

[Blacksmoke16]

Initial implementation of the next-gen way to configure/extend Athena:

• Removes ACF::Base, ACF::Parameters, Resolvable annotation, and the load_* class methods
  • These features are being merged into the DI component
• Revamps the DI component to leverage a more powerful implementation
  • Removes dep on the config component
  • Extract the various modules into more isolated files/modules into new "compiler pass" concept
  • More robust way to adding/customizing order of said compiler passes
  • Parameters are more statically defined and known at compile time, with placeholders being able to recursively resolve them

TODO:

• [x] - Integrate new concept into rest of framework #383
• [ ] - (follow up) Better way to handle ENV vars
  • Including processors for common ENV operations
• [ ] - (follow up) Look into deprecating some features/replacing some with new annotations
• [x] - (follow up) Service call & setter DI #384

Resolves #332

[Blacksmoke16]

This still needs a pass on docs, but going to merge as is given CI is happy and it's already a big boi PR.

[Blacksmoke16]

So getting back to this and working on remembering where I left off. It seems I'd like to merge this to make future changes more focused. Also seems this is in a working spot, but some things still need wired up. E.g. enabling cors/format handler stuff if configured to do so.

Probably fine merging as is, then following up with a PR to get that stuff working.