separate fast-usdc contract package

[turadg]

refs: #10811

Description

#10811 was getting very big and will likely bit rot before it's all done.

This lands a key step in the migration by separating the contract package from the one going to NPM. Contracts are built from repositories and published to the chain and other artifact repositories. They aren't usable in the JS ecosystem so there's no reason to publish them to NPM.

Some benefits of the separation:

• the @agoric/fast-usdc package is smaller
• it can be imported in UI without pulling in Zoe and Liveslots
• helps developers think about what changes will affect vats vs elsewhere

Security Considerations

none

Scaling Considerations

none

Documentation Considerations

Our example dapps already have a separate contract dir (example) so this reduces the need for documentatio by aligning with that.

Testing Considerations

CI

Upgrade Considerations

no behavioral changes

[turadg]

Dropped to draft while to solve this knot:

• @agoric/builders depends on @agoric/fu-contract which I don't want to publish
• @agoric/cosmic-swingset currently needs the builders in order to start a chain
• @agoric/vm-config doesn't depend on the builders package but its JSON configs reference it

What I'll probably have to do is make cut the dependency of builders on fu-contract and make users of that do a little more work to get their fu-contract core-eval builds.

cc @michaelfig for other ideas

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