refactor: Index dependency metadata by `when` spec

Part 1 of making all package metadata indexed by `when` condition. This
will allow us to handle all the dictionaries on `PackageBase` consistently.

Convert the current dependency dictionary structure from this:

    { name: { when_spec: [Dependency ...] } }

to this:

    { when_spec: { name: [Dependency ...] } }

On an M1 mac, this actually shaves 5% off the time it takes to load all
packages, I think because we're able to trade off lookups by spec key
for more lookups by name.

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