Add Facebook Pages Integration

This issue tracks the implementation of an integration for **Facebook Pages** in Elsa Workflows. The module should allow workflows to interact with Facebook Pages, supporting content creation, management, and monitoring activities.

## **Tasks**
- [ ] Create a new module: `Elsa.Integrations.FacebookPages`
- [ ] Implement **Workflow Activities**:
- [ ] **CreateComment** - Creates a comment.
- [ ] **CreatePost** - Creates a post.
- [ ] **CreatePostWithPhotos** - Creates a multi-photo post.
- [ ] **DeleteComment** - Deletes a comment.
- [ ] **DeletePhoto** - Deletes a photo.
- [ ] **DeletePost** - Deletes a post.
- [ ] **DeleteVideo** - Deletes a video.
- [ ] **GetPostReactions** - Returns the number of reactions for a post.
- [ ] **GetComment** - Retrieves information about a comment.
- [ ] **GetPage** - Retrieves details about a page.
- [ ] **GetPhoto** - Retrieves information about a photo.
- [ ] **GetPost** - Retrieves information about a post.
- [ ] **GetVideo** - Retrieves information about a video.
- [ ] **LikePost** - Likes a post.
- [ ] **ListComments** - Retrieves comments for a post.
- [ ] **ListPhotos** - Retrieves photos.
- [ ] **ListPosts** - Retrieves posts.
- [ ] **ListVideos** - Retrieves videos.
- [ ] **UnlikePost** - Unlikes a post.
- [ ] **UpdateComment** - Updates a comment.
- [ ] **UpdatePage** - Updates details on a page, such as phone or email.
- [ ] **UpdatePost** - Updates a post.
- [ ] **UpdateVideo** - Updates a video.
- [ ] **UploadPhoto** - Uploads a photo.
- [ ] **UploadVideo** - Uploads a video.
- [ ] **WatchComments** - Triggers when a new comment is added.
- [ ] **WatchPhotos** - Triggers when a new photo is added.
- [ ] **WatchPosts** - Triggers when a new post is added.
- [ ] **WatchPostsPublicPage** - Triggers when a new post is added to the selected public page.
- [ ] **WatchVideos** - Triggers when a new video is added.

- [ ] Add Unit Tests
- [ ] Add Documentation (`README.md`)

## **References**
- 📖 [Facebook Pages API Docs](https://developers.facebook.com/docs/pages/)
- 🛠️ [Facebook Developer Resources](https://developers.facebook.com/)

## **Notes**
- This should follow the standard structure used for Elsa Integrations.
- The integration should support authentication via OAuth 2.0.

## **Contributor Guidelines**
If you're interested in working on this issue:

1. Comment below to claim it.
2. Follow the [CONTRIBUTING.md](https://github.com/elsa-workflows/elsa-integrations/blob/main/CONTRIBUTING.md) guide.
3. Submit a PR referencing this issue.

Start with CONTRIBUTING.md, the Facebook Pages API documentation, and existing Elsa integration modules to understand the standard structure and OAuth 2.0 expectations. Implement the listed Facebook Pages workflow activities, then add unit tests and README.md documentation. Done means the module is complete, tested, documented, and supports the requested page, post, comment, photo, and video operations.

Written by the indexing model from the issue text.