feat: optimize vacuum drop table, execute in parallel

[lichuang]

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Summary

feat: optimize vacuum drop table, execute in parallel

• 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):

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This change is 

[dantengsky]

besides:

• cargo clippy complaints
  https://github.com/datafuselabs/databend/actions/runs/9041307782/job/24846563784?pr=15478#step:4:4786

• with this PR, the meaning of the parameter dry_runt_limit will change

the number of files returned might be slightly larger than dry_runt_limit. we either need to update the documentation accordingly or adjust the list of files that are returned (at the end of execution).