Add OpenAI and PostgreSQL credential management

- Implemented OpenAICredencial class for managing OpenAI API keys.
- Created OpenAICredencialModel and OpenAICredencialMapper for SQLAlchemy integration.
- Developed OpenAICredencialRepo for CRUD operations on OpenAI credentials.
- Established OpenAICliente class for interacting with OpenAI API.
- Introduced PostgresCredencial class for managing PostgreSQL connection details.
- Created PostgresCredencialModel and PostgresCredencialMapper for SQLAlchemy integration.
- Developed PostgresCredencialRepo for CRUD operations on PostgreSQL credentials.
- Added base connection class and PostgreSQL connection implementation.
- Included environment variable loading for sensitive data management.

src/ApiKeys/openai_apikey.py

@@ -0,0 +1,21 @@
+class OpenAICredencial:
+    def __init__(self, titulo: str, api_key: str, organizacion: str = None):
+        """
+        :param titulo: Nombre descriptivo para esta credencial.
+        :param api_key: Clave secreta de la API de OpenAI.
+        :param organizacion: (Opcional) ID de la organización asociada a la cuenta de OpenAI.
+        """
+        self.titulo = titulo
+        self.api_key = api_key
+        self.organizacion = organizacion
+
+    def get_headers(self) -> dict:
+        """
+        Retorna los encabezados necesarios para autenticar una petición HTTP a OpenAI.
+        """
+        headers = {
+            "Authorization": f"Bearer {self.api_key}"
+        }
+        if self.organizacion:
+            headers["OpenAI-Organization"] = self.organizacion
+        return headers