add new workflow block

[LawyZheng]

[!IMPORTANT] This PR adds new workflow blocks ValidationBlock and ActionBlock, updates the database schema for task criteria and prompt templates, and introduces new prompt templates for task actions.

• Database Schema:
  • Adds columns prompt_template, complete_criterion, and terminate_criterion to tasks table in 2024_11_21_0708-2d79d5fc1baa_add_task_prompt_template_complete_.py.
• Workflow Blocks:
  • Introduces ValidationBlock and ActionBlock in block.py with specific execution logic.
  • Updates block_yaml_to_block() in service.py to handle new block types.
• Prompt Templates:
  • Adds new templates decisive-criterion-validate.j2, single-click-action.j2, single-input-action.j2, single-select-action.j2, and single-upload-action.j2 for different task actions.
• Enums and Models:
  • Adds TaskPromptTemplate and ActionType enums in enums.py.
  • Updates TaskModel in models.py to include new fields for task criteria and prompt templates.
• Misc:
  • Modifies create_task() in client.py to include new task fields.
  • Updates convert_to_task() in utils.py to handle new task attributes.

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