ENH: list NOAA atmosphere datasets and fetch latest (#660)

[thatrandomasiandev]

Summary

• Adds best-effort helpers to list NCEP atmosphere collections and per-collection run identifiers from the Unidata THREDDS catalogs RocketPy already uses for GFS/NAM/RAP/HRRR/AIGFS (list_noaa_atmosphere_datasets, list_noaa_dataset_identifiers).
• Adds convenience APIs to resolve and open the latest collection run via OPeNDAP (get_latest_noaa_opendap_url, fetch_latest_noaa_dataset) without changing Environment.
• Documents limitations: NOMADS OPeNDAP is retired, so discovery scrapes THREDDS XML catalogs (layout can change); “download” means opening the remote dataset handle (same pattern as existing fetchers), not writing a local GRIB file.

Fixes #660

Test plan

• PYTEST_DISABLE_PLUGIN_AUTOLOAD=1 python -m pytest tests/unit/environment/test_fetchers.py -q (25 passed; catalog/HTTP mocked, no live NOAA)

[codecov]

Codecov Report

❌ Patch coverage is 81.25000% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.26%. Comparing base (e0ff281) to head (9cbbc43).
⚠️ Report is 53 commits behind head on develop.

Files with missing lines	Patch %	Lines
rocketpy/environment/fetchers/noaa_catalog.py	81.13%	30 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1136      +/-   ##
===========================================
+ Coverage    82.18%   83.26%   +1.08%     
===========================================
  Files          122      131       +9     
  Lines        16355    17232     +877     
===========================================
+ Hits         13441    14349     +908     
+ Misses        2914     2883      -31     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.