refactoring TxnEvent to support callback data and return error with callback function (ISCP integration Step 1)

[cpegeric]

User description

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue #22595

What this PR does / why we need it:

refactoring txnevent

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PR Type

Enhancement

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Description

• Refactor TxnEvent callback system to support error handling

• Add context parameter to all callback functions

• Replace simple function callbacks with TxnEventCallback struct

• Update all callback registrations across services

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Diagram Walkthrough

flowchart LR
  A["Old Callback System"] --> B["TxnEventCallback Struct"]
  B --> C["Error Handling Support"]
  B --> D["Context Parameter"]
  C --> E["Service Updates"]
  D --> E

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File Walkthrough

	Relevant files
Tests	9 files service_test.go Update test mock callback signature                                            +1/-1      engine_mock.go Update mock method signatures and parameters                          +22/-20  txn_mock.go Update mock TxnOperator callback signature                              +1/-1      txn_test.go Update test TxnOperator callback signature                              +1/-1      store_sql_test.go Update test callback signature                                                      +1/-1      storage_test.go Refactor test callbacks with error handling                            +24/-20  storage_test.go Update test storage callbacks                                                        +20/-16  operator_events_test.go Update test with new callback structure                                    +6/-3      entire_engine_test.go Update test operator callback signature                                    +1/-1
Enhancement	10 files service.go Update callback registration with new wrapper                        +4/-3      store_mem.go Refactor callback to return error and accept context          +12/-10  service.go Update callback with error handling support                            +7/-5      service.go Update service callbacks with new structure                            +26/-22  client.go Update client callback registration and handlers                  +11/-5    operator.go Core refactoring of callback system implementation              +37/-17  operator_events.go Implement new callback structure and error handling            +11/-6    types.go Define TxnEventCallback struct and helper functions            +18/-1    storage_txn_client.go Update storage callback signature                                                +1/-1      service_txn_event.go Update trace service callbacks with error handling              +26/-20

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[XuPeng-SH]

It's just a temporary fix to test the functionality; it's not production-ready.