feat(anta): Added the test case to verify the BGP route origin

[vitthalmagadum]

Description

Verifies BGP route origin for the provided IPv4 Network(s).

Expected Results
----------------
* Success: The test will pass if the BGP route's origin matches expected origin type.
* Failure: The test will fail if the BGP route's origin does not matches with expected origin type or BGP route entry(s) not found.

Fixes #811

Checklist:

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my code
• [X] I have run pre-commit for code linting and typing (pre-commit run)
• [ ] I have made corresponding changes to the documentation
• [X] I have added tests that prove my fix is effective or that my feature works
• [X] New and existing unit tests pass locally with my changes (tox -e testenv)