feat(anta): Added test case to verify maximum total number of routes configured and optionally verifies the warning limit

[vitthalmagadum]

Description

Verifies maximum routes and maximum routes warning limit for the provided BGP IPv4 peer(s).

Expected Results
----------------
* Success: The test will pass if the BGP peer's maximum routes and maximum routes warning limit are equal to given limits.
* Failure: The test will fail if the BGP peer's maximum routes and maximum routes warning limit are not equal to given limits or
peer is not configured.

Fixes #784

Checklist:

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

[MaheshGSLAB]

First round of review

[MaheshGSLAB]

LGTM

[carl-baillargeon]

LGTM. Tested locally.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud