New Writing Feedback Generator Expedition

[AaronSosaRamos]

This PR was made for implementing the new Writing Feedback Generator. Here is a payload with a file:

{
   "user": {
      "id": "string",
      "fullName": "string",
      "email": "string"
   },
   "type": "tool",
   "tool_data": {
      "tool_id": 14,
      "inputs": [
         {
            "name": "grade_level",
            "value": "university"
         },
         {
            "name": "assignment_description",
            "value": "Linear Algebra"
         },
         {
            "name": "criteria",
            "value": "Understand the concepts of vector spaces, linear transformations, and matrix operations."
         },
         {
            "name": "writing_to_review",
            "value": ""
         },
         {
            "name": "file_url",
            "value": "https://firebasestorage.googleapis.com/v0/b/kai-ai-f63c8.appspot.com/o/uploads%2F510f946e-823f-42d7-b95d-d16925293946-Linear%20Regression%20Stat%20Yale.pdf?alt=media&token=caea86aa-c06b-4cde-9fd0-42962eb72ddd"
         },
         {
            "name": "file_type",
            "value": "pdf"
         },
         {
            "name": "lang",
            "value": "en"
         }
      ]
   }
}

And here is the payload without a file:

{
   "user": {
      "id": "string",
      "fullName": "string",
      "email": "string"
   },
   "type": "tool",
   "tool_data": {
      "tool_id": 14,
      "inputs": [
         {
            "name": "grade_level",
            "value": "university"
         },
         {
            "name": "assignment_description",
            "value": "Linear Algebra"
         },
         {
            "name": "criteria",
            "value": "Understand the concepts of vector spaces, linear transformations, and matrix operations."
         },
         {
            "name": "writing_to_review",
            "value": "Linear Algebra is a foundational branch of mathematics that is widely used across multiple disciplines, including data science, engineering, physics, and computer science. It provides essential tools for analyzing and solving systems of linear equations, representing geometric transformations, and modeling real-world phenomena through matrix operations and vector spaces. By mastering concepts such as eigenvalues, eigenvectors, and linear transformations, students can apply these techniques to optimize processes, develop machine learning algorithms, and understand complex systems. Furthermore, linear algebra plays a crucial role in the development of technologies like image processing, 3D modeling, and network analysis, making its study indispensable for modern technological advancements."
         },
         {
            "name": "file_url",
            "value": ""
         },
         {
            "name": "file_type",
            "value": ""
         },
         {
            "name": "lang",
            "value": "en"
         }
      ]
   }
}

And here is the response:

[yunusj]

Why is document loaded added as a new file in this?
Secondly, resolve conflicts

[AaronSosaRamos]

The document_loaders.py file is "added" because I created the PR before of developing a general util file for all the tools. But is actually the same as the Develop branch.
The conflicts are solved @yunusj.