Add MET ASCII2NC supported datasets to verification datasets

[DanielAdriaansen]

Describe the Enhancement

When testing the UGRID capability, I noticed that here: https://met.readthedocs.io/en/develop/Users_Guide/reformat_point.html#ascii2nc-tool

We describe various datasets that are supported by ASCII2NC. However, not all of them are documented here: https://metplus.readthedocs.io/en/develop/Verification_Datasets/index.html

Notably:

1. AirNow
2. NBDC Buoy
3. IABP
4. SURFRAD

Seem to be absent from the "Verification Datasets" page. NBDC Buoy data were what I was using. Looking through old PR's, issues, and use cases, I see:

AirNow

https://github.com/dtcenter/MET/pull/2314 https://github.com/dtcenter/MET/pull/2373 (@JohnHalleyGotway and @davidalbo)

NBDC Buoy

https://github.com/dtcenter/MET/pull/2294 https://github.com/dtcenter/METplus/pull/1908 (@j-opatz and @davidalbo)

IABP

https://github.com/dtcenter/MET/pull/2846 (@JohnHalleyGotway and @davidalbo)

SURFRAD

https://github.com/dtcenter/MET/issues/205 (@JohnHalleyGotway)

I'll create stubs in the documentation for each dataset, and coordinate with the above folks to curate the content on the page and/or review the content that I add.

Time Estimate

1 day

Relevant Deadlines

NONE.

Funding Source

Define the source of funding and account keys here or state NONE.

Define Related Issue(s)

Consider the impact to the other METplus components.

• [ ] METplus, MET, METdataio, METviewer, METexpress, METcalcpy, METplotpy

Enhancement Checklist

See the METplus Workflow for details.

• [ ] Complete the issue definition above, including the Time Estimate and Funding Source.
• [ ] Fork this repository or create a branch of develop. Branch name: feature_<Issue Number>_<Description>
• [ ] Complete the development and test your changes.
• [ ] Add/update log messages for easier debugging.
• [ ] Add/update unit tests.
• [ ] Add/update documentation.
• [ ] Add any new Python packages to the METplus Components Python Requirements table.
• [ ] Push local changes to GitHub.
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• [ ] Close this issue.

[DanielAdriaansen]

Should also just do #2448 at the same time as this- touching the same code.

[DanielAdriaansen]

Working in branch feature_2568_vx_datasets_update.