Load formulae from internal API

[Rylan12]

Note: this is still very much a work in progress

The goal here is to load formulae using the new minimal API, and then only load the rest of the formula once we know it’s actually needed. This doesn’t quite work correctly yet, but I wanted to open this in case folks wanted to give feedback on the general approach.

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Not yet implemented in this PR:

There are two main categories for brew commands:

1. The user requests action for a specific formula. For example, info, deps, etc. In these cases, it's appropriate to load the full formula when the arguments are parsed.
2. Bulk actions, like outdated, upgrade, search. In these cases, we want to intentionally delay loading the full formulae until we're sure we need them.

(install is kind of a middle-ground since it's on-request but also can stop early if the formula is already installed).

So, my plan is to make adjustments to the arg parser so this can be handled at arg-parse time when possible

[MikeMcQuaid]

Looks good so far! Once it's working OK for you locally would suggest trying to split out the bits that are refactoring no-ops of existing code and getting them merged in to slim the diff.