[AUR-338, AUR-406, AUR-407] Export pipeline to config for PromptUI. Construct PromptUI dynamically based on config. (#16)

From pipeline > config > UI. Provide example project for promptui

- Pipeline to config: `kotaemon.contribs.promptui.config.export_pipeline_to_config`. The config follows schema specified in this document: https://cinnamon-ai.atlassian.net/wiki/spaces/ATM/pages/2748711193/Technical+Detail. Note: this implementation exclude the logs, which will be handled in AUR-408.
- Config to UI: `kotaemon.contribs.promptui.build_from_yaml`
- Example project is located at `examples/promptui/`

.pre-commit-config.yaml

@@ -25,7 +25,7 @@ repos:
     rev: 4.0.1
     hooks:
       - id: flake8
-        args: ["--max-line-length", "88"]
+        args: ["--max-line-length", "88", "--extend-ignore", "E203"]
   - repo: https://github.com/myint/autoflake
     rev: v1.4
     hooks:
@@ -47,4 +47,5 @@ repos:
     rev: "v1.5.1"
     hooks:
       - id: mypy
+        additional_dependencies: [types-PyYAML==6.0.12.11]
         args: ["--check-untyped-defs", "--ignore-missing-imports"]