[18.0][ADD] social_media_facebook: Add Facebook integration

[DinhVanKhanh-HCMC]

Social Media Facebook Module for Odoo

This repository introduces a new Facebook integration module for Odoo, enabling users to manage, schedule, and publish social media posts directly from Odoo.
The module is built on top of the existing social_media_base framework and provides dedicated features for Facebook social media management.

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Key Features

• Facebook account integration using OAuth and system user tokens
• Create, schedule, and publish Facebook posts directly from Odoo
• Support for posting images and videos
• Publish content to multiple Facebook accounts
• Display post performance metrics such as impressions and engagements

Depend on:

• [18.0][MIG] social_media_base: Migration to 18.0 #1769