[Feature] Add Gmail connector

[CREDO23]

Description

• Add Gmail connector

Screenshots

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance improvement (non-breaking change which enhances performance)
• Documentation update
• Breaking change (fix or feature that would cause existing functionality to change)

Testing

• I have tested these changes locally
• I have added/updated unit tests
• I have added/updated integration tests

Checklist:

• My code follows the code style of this project
• My change requires documentation updates
• I have updated the documentation accordingly
• My change requires dependency updates
• I have updated the dependencies accordingly
• My code builds clean without any errors or warnings
• All new and existing tests passed