Feat/Blob 4844 Pi Circuit Chunk Txbytes Condense

[darth-cy]

Description

Simplifies the chunk_txbytes section within PICircuit and condenses the section into one row with a copy constraint for TxCircuit where the correctness of l2 tx bytes accumulation and final keccak hash is actually ascertained.

• Remove pow_of_rand from PICircuit.
• Remove accumulation scheme for chunk txbytes in PICircuit.

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update
• [x] Refactor (no updates to logic)

[darth-cy]

Apologies. Selected the wrong target branch.