[AUR-390] Add prompt template and prompt component (#24)

* Export pipeline to config

* Export the input to config

* Preliminary creating UI dynamically

* Add test for config export

* Try out prompt UI

* Add example projects

* Fix test errors

* Standardize interface for retrieval

* Finalize the UI demo

* Update README.md

* Update README

* Refactor according to main

* Fix typing issue

* Add openai key to git-secret

* Add prompt template and prompt component

* Update test

* update tests

* revert docstring

---------

Co-authored-by: trducng <trungduc1992@gmail.com>
Co-authored-by: Nguyen Trung Duc (john) <john@cinnamon.is>

knowledgehub/prompt/template.py

@@ -0,0 +1,68 @@
+import re
+from typing import Set
+
+
+class PromptTemplate:
+    """
+    Base class for prompt templates.
+    """
+
+    @staticmethod
+    def extract_placeholders(template: str) -> Set[str]:
+        """
+        Extracts placeholders from a template string.
+
+        Args:
+            template (str): The template string to extract placeholders from.
+
+        Returns:
+            set[str]: A set of placeholder names found in the template string.
+        """
+        placeholder_regex = r"{([a-zA-Z_][a-zA-Z0-9_]*)}"
+
+        placeholders = set()
+        for item in re.findall(placeholder_regex, template):
+            if item.isidentifier():
+                placeholders.add(item)
+
+        return placeholders
+
+    def __init__(self, template: str):
+        self.placeholders = self.extract_placeholders(template)
+        self.template = template
+
+    def populate(self, **kwargs):
+        """
+        Populate the template with the given keyword arguments.
+
+        Args:
+            **kwargs: The keyword arguments to populate the template.
+                      Each keyword corresponds to a placeholder in the template.
+
+        Returns:
+            str: The populated template.
+
+        Raises:
+            ValueError: If an unknown placeholder is provided.
+
+        """
+        prompt = self.template
+        for placeholder, value in kwargs.items():
+            if placeholder not in self.placeholders:
+                raise ValueError(f"Unknown placeholder: {placeholder}")
+            prompt = prompt.replace(f"{{{placeholder}}}", value)
+
+        return prompt
+
+    def __add__(self, other):
+        """
+        Create a new PromptTemplate object by concatenating the template of the current
+            object with the template of another PromptTemplate object.
+
+        Parameters:
+            other (PromptTemplate): Another PromptTemplate object.
+
+        Returns:
+            PromptTemplate: A new PromptTemplate object with the concatenated templates.
+        """
+        return PromptTemplate(self.template + "\n" + other.template)