[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/`

knowledgehub/contribs/promptui/base.py

@@ -0,0 +1,20 @@
+import gradio as gr
+
+COMPONENTS_CLASS = {
+    "text": gr.components.Textbox,
+    "checkbox": gr.components.CheckboxGroup,
+    "dropdown": gr.components.Dropdown,
+    "file": gr.components.File,
+    "image": gr.components.Image,
+    "number": gr.components.Number,
+    "radio": gr.components.Radio,
+    "slider": gr.components.Slider,
+}
+SUPPORTED_COMPONENTS = set(COMPONENTS_CLASS.keys())
+DEFAULT_COMPONENT_BY_TYPES = {
+    "str": "text",
+    "bool": "checkbox",
+    "int": "number",
+    "float": "number",
+    "list": "dropdown",
+}