Cost analysis of blob proof

[CeciliaZ030]

Describe the feature request

Following #292 we've implemented and merged the Proof of Equivalence. We show the cost analysis assuming 0.1 cent/1M cycles on Succinct Network, and the gas price is 5 Gwei on mainnet.

• If we run the whole KZG with Sp1's kzg patch, no need to call KZG point eval precompile on-chain
• otherwise we use PoE and call the precompile, which cost 5000

Note that PoE is cheaper if the gas price is less than 2 Gwei.

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