test(extractors/solana): OF1 vs JSON-RPC comparison example

[sistemd]

• An example program that compares the output of OF1 and JSON-RPC clients to make sure that the data is consistent between the two.
• This will also serve as a test to make sure that the data we are reading from the Old Faithful archive is correct. Here we'll consider JSON-RPC as the source of truth.

[claude]

Thanks for adding this comparison utility - it's a useful tool for validating data consistency between OF1 and JSON-RPC sources.

Summary of review comments:

1. Missing block_rewards comparison - The slots_match function compares transactions and messages but not block_rewards, even though the struct now derives PartialEq.

2. Error handling - The car manager task result is silently discarded; consider logging failures.

3. Code structure - The else blocks after early-return if statements are unnecessary and add nesting.

4. Counter overflow - Using u8 for mismatched_slots could overflow in edge cases; consider saturating_add or a larger type.

5. Derive removals - Clone was removed from several structs. Since these are now public, this could affect downstream flexibility.

6. Visibility inconsistencies - ui_token_amount field and TokenAmount struct weren't made public while similar fields/structs were.

7. Comparison semantics - Slots missing in RPC but present in OF1 are skipped without incrementing mismatched_slots. The reverse case (missing in OF1) isn't explicitly handled.

[claude]

The slots_match function does not compare block_rewards. The NonEmptySlot struct has a block_rewards: block_rewards::BlockRewards field that is not being compared here, but BlockRewards now derives PartialEq.

Consider adding:

if of1_slot.block_rewards != rpc_slot.block_rewards {
    tracing::warn!(
        %slot_num,
        of1_rewards_count = %of1_slot.block_rewards.rewards.len(),
        rpc_rewards_count = %rpc_slot.block_rewards.rewards.len(),
        "block rewards mismatch"
    );
    return false;
}

[sistemd]

Block rewards will be handled in a follow up PR that addresses known (discovered through solana_compare) mismatches.