AutoGPT: Move all the Agent's prompt generation code into a PromptStrategy

[Pwuts]

Background

• More modularity
• Better statelessness
• Getting rid of PromptGenerator

Changes 🏗️

• Fix execution of async commands
• Move all the Agent's prompt building code into OneShotAgentPromptStrategy
• Start using JSONSchema for commands' parameter definitions

PR Quality Scorecard ✨

• Have you used the PR description template?   +2 pts
• Is your pull request atomic, focusing on a single change?   +5 pts
• Have you linked the GitHub issue(s) that this PR addresses?   +5 pts
• Have you documented your changes clearly and comprehensively?   +5 pts
• Have you changed or added a feature?   -4 pts
  • Have you added/updated corresponding documentation?   +4 pts
  • Have you added/updated corresponding integration tests?   +5 pts
• Have you changed the behavior of AutoGPT?   -5 pts
  • Have you also run agbenchmark to verify that these changes do not regress performance?   +10 pts

[github-actions]

This PR exceeds the recommended size of 500 lines. Please make sure you are NOT addressing multiple issues with one PR.

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[github-actions]

This PR exceeds the recommended size of 500 lines. Please make sure you are NOT addressing multiple issues with one PR.

[github-actions]

This PR exceeds the recommended size of 500 lines. Please make sure you are NOT addressing multiple issues with one PR.

[github-actions]

This PR exceeds the recommended size of 500 lines. Please make sure you are NOT addressing multiple issues with one PR.

[github-actions]

This PR exceeds the recommended size of 500 lines. Please make sure you are NOT addressing multiple issues with one PR.

[github-actions]

This PR exceeds the recommended size of 500 lines. Please make sure you are NOT addressing multiple issues with one PR.

[github-actions]

This PR exceeds the recommended size of 500 lines. Please make sure you are NOT addressing multiple issues with one PR.

[github-actions]

This PR exceeds the recommended size of 500 lines. Please make sure you are NOT addressing multiple issues with one PR.