[tokenvm] Overhaul Fees

[patrick-ogrady]

Naïve fee pricing/usage targets were added during initial development. We should revisit these and add the updated values to the README.

Changes

• Charge for keys specified in pre-fetch
• Charge a fee if new state created

[patrick-ogrady]

As part of this overhaul, we may find it useful to break apart "units" into specialized units that are independently priced (ex: CPU, State, Size)

Related work: https://angeris.github.io/papers/block-space.pdf (https://arxiv.org/abs/2208.07919)

[patrick-ogrady]

It would also be great if we can find some way to remove the notion of block cost and surplus fee.

We should ideally just refund anything above the required fee.

[patrick-ogrady]

With the current parameters, a "full" block can sometimes only be ~200KB:

[patrick-ogrady]

We should require a state deposit that is returned when state is freed (minus some penalty) to discourage state bloat attacks.

[patrick-ogrady]

Have a few that is always charged and then have a storage fee that if not paid, causes the tx to revert.

Both should be included in the tx result (we should not deduct balance hidden).

We can also deduct keys requested to prefetch from this balance too.