feat(agents-api): Add python expression support to prompt step

[creatorrr]

• wip(agents-api): Auto-run tools in prompt steps
• refactor: Lint integrations-service (CI)
• feat(agents-api): Add python expression support to prompt step
• feat(agents-api): Default prompt_step.tools = 'all'

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[!IMPORTANT] Add Python expression support to prompt steps in agents API, with default tool settings and refactoring.

• Behavior:
  • Add Python expression evaluation for prompts starting with $_ in prompt_step() in prompt_step.py.
  • Default tools in PromptStep to 'all' in Tasks.py.
  • Default auto_run_tools to True for PromptStep and False for sessions in Sessions.py and Tasks.py.
• Refactoring:
  • Remove unused import Developer from execute_system.py.
  • Remove unused import RootModel from Tools.py.
  • Linting changes in integrations-service.
• Testing:
  • Add test for prompt step with Python expression in test_execution_workflow.py.

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[sweep-ai[bot]]

Hey @creatorrr, here is an example of how you can ask me to improve this pull request:

@sweep Add unit tests for `base_evaluate` function in `prompt_step.py` to test Python expression evaluation with different types of expressions and context data.

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