Connector: Add VertexAI connector

[harshsoni2024]

Describe your changes:

Fixes

I worked on ... because ...

Type of change:

• [ ] Bug fix
• [ ] Improvement
• [x] New feature
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation

Checklist:

• [x] I have read the CONTRIBUTING document.
• [ ] My PR title is Fixes <issue-number>: <short explanation>
• [ ] I have commented on my code, particularly in hard-to-understand areas.
• [ ] For JSON Schema changes: I updated the migration scripts or explained why it is not needed.

[github-actions[bot]]

The Python checkstyle failed.

Please run make py_format and py_format_check in the root of your repository and commit the changes to this PR. You can also use pre-commit to automate the Python code formatting.

You can install the pre-commit hooks with make install_test precommit_install.

[sonarqubecloud[bot]]

Quality Gate failed for 'open-metadata-ingestion'

Failed conditions
0.0% Coverage on New Code (required ≥ 20%)

See analysis details on SonarCloud