refactor(ethereum): decompose indexer - #1092
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…r catchup and live block processing
…d clean up `TestIndexerBuilder`
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Refactor Ethereum indexer by extracting few largely independent concerns:
Main changes:
chain-integration-core::utils::task)CancellationTokenExttrait that implementscancelled_within(dur)method - a cancellation-aware sleepretry_until_ok(cancel, delay, label, process)helper - retries async operation in the loop with backoff until Ok or cancel (re-used in both Ethereum and Solana crates)ExecutionWatcher(chain-ethereum/src/execution_watcher.rs) to isolate execution-confirmation logicFinalizedHeadTracker(chain-ethereum/src/finalized_head.rs) - owns the finalized-headwatchchannel, exposescurrent(),wait_for(block),spawn_watcher(client, cancel)method. The optimistic-mode gate lives here now.No behavior changes.
indexer.rswent from 3177 to 1393 LOC