GH-605: Review two

[utkarshg6]

Note

Replace fingerprint-based pending-payables with sent/failed tx tracking and new receipt/status types; refactor scanners/scheduling, adjust blockchain receipt API, compute chain-based defaults, and drop the pending_payable table.

• Accountant/Scanners:
  • Introduce DetailedScanType; replace ReportTransactionReceipts with TxReceiptsMessage and PendingPayableFingerprintSeeds with RegisterNewPendingPayables.
  • Revamp PendingPayableScanner with in-memory caches, recheck logic, and distinct handling for confirmations/reclaims/validation failures.
  • Rename ScanRescheduleAfterEarlyStop → ScanReschedulingAfterEarlyStop; refine retry/reschedule behavior.
  • Switch amount/gas fields to amount_minor/gas_price_minor; update comparisons and logs.
• Blockchain:
  • process_transaction_receipts now returns a map keyed by TxHashByTable to TxReceiptResult using StatusReadFromReceiptCheck.
  • Update send flow and logs; minor wording tweak (gas price “computed by this Node”).
• Data structures/Errors:
  • Add TxHashByTable, StatusReadFromReceiptCheck, TxBlock; rework TxStatus/FailureStatus with ValidationStatus and PreviousAttempts (serde support).
  • Refine RPC/Blockchain error kinds (split local/remote) and display.
• DB/Migrations:
  • Compute default ScanIntervals per-chain; migrate scan_intervals accordingly.
  • Remove pending_payable table (migration 10→11); adjust schema and DAO usage.
• Config/Validation:
  • Validate scan-intervals relationship and payment-thresholds; expose neighborhood/rate/scan settings.
• Tests/Utils:
  • Extensive test updates; add serializer mocks, receipt builders, and helper utilities.

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