chore: Add delay buffer tests for EigenDA inbox entry-point

[ethenotethan]

Changes

• Extended existing delayBufferable tests to also assert correctness of delay buffer for eigenda inbox entry-point
• Updated hardhat local inbox construction logic to also deploy a l2 blob verifier artifact and set the address as a mutable inbox field
• Tests were failing since they were trying to reference a batchSpendingReport message object from the delayed inbox for computing the number of delayed messages read. Chose to update the EigenDA entry-point to include the batch spending report processing logic. This ensures that the call-data fees paid by the current batch poster are amortized or paid back by L2 users. This will need to be tested to ensure E2E compatibility with core nitro node software.