feat: messages and contacts history fetch

[CayoPOliveira]

Pull Request Template

Description

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Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)
• This change requires a documentation update

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Checklist:

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This change is 

Summary by CodeRabbit

• New Features

  • Added options in WhatsApp channel settings to sync only contacts or both messages and contacts during setup.
  • Introduced advanced synchronization controls in the WhatsApp channel creation interface, allowing for more granular data import.
  • Enabled fetching of historical WhatsApp messages to enhance conversation completeness.

• Localization

  • Updated English and Portuguese (Brazil) translations to support new WhatsApp synchronization options in the inbox management settings.

• Enhancements

  • Improved backend support for initial WhatsApp data synchronization, including handling of message and contact history.
  • Added functionality to fetch and process WhatsApp message history with media attachments.
  • Introduced environment variable to configure message history fetch count.

• Bug Fixes

  • Added control to prevent message flooding validation for specific message processing scenarios.