[new driver] : add TARA payment gateway driver

[roshandelpoor]

This pull request introduces support for the TARA payment gateway by adding a new driver implementation to the package.

✨ Key changes:

• Added a new TARA driver that integrates with the TARA payment API.
• Implemented request/response handling for payment initialization and verification.
• Added configuration options for TARA credentials (e.g., merchant ID, API key, callback URL).
• Provided error handling and exceptions consistent with existing gateway drivers.
• Updated documentation and usage examples to include the TARA gateway.
• Added unit tests to ensure driver stability and correctness.

✅ Benefits:

• Expands available payment gateway options for users of the package.
• Enables refund capability for TARA payments.
• Ensures a consistent developer experience across all supported gateways.

Documents:

• Tara IPG Purchase Online.pdf
• Tara IPG Purchase Refund.pdf