Add Batch CLI Support and Refactor Task Building Logic

[Denise2004]

Add Batch CLI Support and Refactor Task Building Logic

Summary

This PR adds batch CLI support, allowing users to build and execute multiple test tasks from YAML configuration files. It also refactors the task building logic by separating task construction from execution, improving code reusability.

Key Changes

1. New Batch CLI Feature (vectordb_bench/cli/batch_cli.py)

• Supports reading multiple task configurations from batch config files
• Automatically collects all tasks and uses a unified task_label

2. Refactored Task Building Logic (vectordb_bench/cli/cli.py)

• Split run function into two functions:
  • build_task: Only builds task configuration without executing
  • run: Calls build_task to build configuration and executes tasks

[sre-ci-robot]

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This pull-request has been approved by: Denise2004
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