[AMORO-3951] Implement the table merge

[mansonliwh]

Why are the changes needed?

Previously, table-level process information was split across two models (table_process_state and table_process), causing duplication. Additionally, TableProcessMeta.processType used a String type, which lacked type safety. This PR unifies the storage model, introduces type-safe Action objects, and creates a unified scheduling system for both Optimizing and Maintainer operations.

Brief change log

• Unified storage: merged table_process_state and table_process into a single model using table_process table
• Type-safe Actions: refactored TableProcessMeta.processType from String to Action type
• New Optimizing Actions: added OPTIMIZING_MINOR, OPTIMIZING_MAJOR, OPTIMIZING_FULL in IcebergActions
• Created Action2StringConverter: MyBatis TypeHandler for Action ↔ database string conversion
• Updated mappers and services: TableProcessMapper and ProcessService now use Action type
• Fixed compilation errors in production and test code

How was this patch tested?

• Updated test cases to work with new Action type
• Verified backward compatibility with deprecated methods
• Tested Action conversion and database compatibility
• All code compiles without errors
• Manual testing of Optimizing processes
• Integration testing of Maintainer operations

Documentation

• Does this pull request introduce a new feature? (yes / no)

  • Yes

• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

  • JavaDocs added for new methods; comprehensive design doc not included