chore: Update privacy settings, refactor code and improve performance

In this commit, several changes were made to improve the codebase and update privacy settings. Specifically, the following changes were made:

- The `PrivacySetting` class was refactored to `PrivacySettingDto` in `chat.dto.ts`.
- The `put` method was changed to `post` in `chat.router.ts` for updating the profile picture.
- Several methods in `channel.service.ts` were refactored to improve performance and readability. Specifically, the `setWebhook`, `setRabbitmq`, `setSqs`, `fetchContacts`, and `fetchMessages` methods were improved.
- The `updatePrivacySettings` method in `whatsapp.baileys.service.ts` was refactored to reduce complexity and improve readability.

These changes were made to improve the overall performance and maintainability of the codebase. Additionally, the privacy settings for the WhatsApp client were updated to provide better control over user data.

src/api/routes/chat.router.ts

@@ -228,7 +228,7 @@ export class ChatRouter extends RouterBroker {
 
         return res.status(HttpStatus.OK).json(response);
       })
-      .put(this.routerPath('updateProfilePicture'), ...guards, async (req, res) => {
+      .post(this.routerPath('updateProfilePicture'), ...guards, async (req, res) => {
         const response = await this.dataValidate<ProfilePictureDto>({
           request: req,
           schema: profilePictureSchema,