feat(shannon): refactor rapid iii

[ShannonBase]

1: refactor rapid engine. In parse mtr log record stage, using a main thread to mointor the incomming mlog records, and if a new one comes, then launchs a worker thread to process it.

2: minor fix in load_table and unload_table.

3: change the result of 'index_statistics.result', the data can not be loaded into rapid in ShannonBase, but the old result shows that it still scan on rapid egine, it's not a right paln.

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Summary

Briefly describe what this PR aims to solve. Include background context that will help reviewers understand the purpose of the PR.

• Fixes #[Link the issue here]

Tests

• [ ] Unit Test
• [ ] Logic Test
• [ ] Benchmark Test
• [ ] No Test - Explain why

Type of change

• [ ] Bug Fix (non-breaking change which fixes an issue)
• [ ] New Feature (non-breaking change which adds functionality)
• [ ] Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• [ ] Documentation Update
• [ ] Refactoring
• [ ] Performance Improvement
• [ ] Other (please describe):