Enhance the ASCII2NC wrapper to support setting the `-valid_beg` and `-valid_end` command line options

[JohnHalleyGotway]

Describe the Enhancement

The issue dtcenter/MET#2654 and pull request dtcenter/MET#2846 updated the ASCII2NC tool to add support for -valid_beg and -valid_end command line options to support filtering the input point observations by their valid time. These command line options already exist in PB2NC, a similar point pre-processing tool.

This issue is to enhance the ASCII2NC wrapper to support the setting of these command line options in a way that is consistent with how they're supported for PB2NC.

Time Estimate

4 hours?

Sub-Issues

Consider breaking the enhancement down into sub-issues. None.

Relevant Deadlines

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Funding Source

split between Dynamic drought veg (2785031) and the UAlbany (7750034) projects

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Define Related Issue(s)

Consider the impact to the other METplus components.

• [x] METplus, MET, METdataio, METviewer, METexpress, METcalcpy, METplotpy No impacts.

Enhancement Checklist

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• [ ] 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.
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