Fee Payment Contracts

[just-mitch]

We will write a canonical FPC (fee payment contract) that will allow users to pay fees without using the enshrined gas token directly. These contracts specify a list of tokens they support, a commission, and can handle public or private payments, as well as public or private refunds.

FPCs should also be able to be used when initially deploying an account contract (which is itself an action which requires a fee)

Tasks

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1. Public refunds via FPC #4796
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2. Notes created in public setup/teardown phases break notes created in private #4958
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3. Private refunds from FPC via partial notes #4797
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4. Phase manager crash in fees test #5150
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5. Private refunds from FPC via transparent notes #5185
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6. Pay fees natively during account contract initialization #5190
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7. Pay fees via FPC privately during account contract initialization #5191
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8. Pay fees via FPC publicly during account contract initialization #5544
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