[FEAT]: Client ID and Client Secret

[michael-pisman]

Add functionality and endpoints for handling Client credentials(Client ID and secret)

Proposed document:

id - unique id for storing in the database
name - unique name of the client
description - brief description of the client
client_id - 32 characters long string 
secret - 256 characters long string

• Create Document class
• Create functionality for creating, updating, and deleting records
• Add schemas for API requests and responses
• Add API endpoints for the server admin