feat(anta): Added test case to verify SNMP Trap PDUs counters

[vitthalmagadum]

Description

Verifies the number of SNMP PDU(s) (Protocol Data Units) processed.

By default, all SNMP PDU counters will be checked for any non-zero values.
An optional list of specific SNMP PDU(s) can be provided for granular testing.

Expected Results
----------------
* Success: The test will pass if the SNMP PDU counter(s) are non-zero/greater than zero.
* Failure: The test will fail if the SNMP PDU counter(s) are zero/None/Not Found.

Fixes #820

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)

[github-actions[bot]]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[github-actions[bot]]

Conflicts have been resolved. A maintainer will review the pull request shortly.

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #828 will not alter performance

_{Comparing vitthalmagadum:issue_820 (b6848c0) with main (29e08cb)}

Summary

✅ 4 untouched benchmarks

[sonarcloud[bot]]

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