feat: add autoplot of NEXRAD latencies

[akrherz]

https://mesonet.agron.iastate.edu/plotting/auto/?q=254

[deepsource-io[bot]]

Here's the code health analysis summary for commits 930b5ed..cd13716. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Shell	✅ Success		View Check ↗
JavaScript	✅ Success		View Check ↗
Python	✅ Success		View Check ↗
PHP	✅ Success		View Check ↗

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 51.21951% with 20 lines in your changes missing coverage. Please review.

Project coverage is 39.11%. Comparing base (930b5ed) to head (cd13716).

Files	Patch %	Lines
pylib/iemweb/autoplot/scripts200/p254.py	51.21%	20 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #818 +/- ## ========================================== + Coverage 39.09% 39.11% +0.02% ========================================== Files 257 258 +1 Lines 21535 21576 +41 ========================================== + Hits 8419 8440 +21 - Misses 13116 13136 +20 ```

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