Unit test dateTime datatypes after update

[wendellpiez]

User Story:

Following correction to regular expressions made in #224 let's unit test the dateTime datatypes (with and without time zones) in Metaschema unit testing.

That Issue gives links to examples of passing and failing values to use. Testing should expose edge cases as well as normal cases.

Goals:

Unit test the latest regular expressions (JSON and XSD) for date- and time-related datatypes.

Continue to build out the capabilities of Metaschema unit testing (of validity and functionality of generated schemas).

Dependencies:

#224

Acceptance Criteria

• All website and readme documentation affected by the changes in this issue have been updated. Changes to the website can be made in the docs/content directory of your branch.
• A Pull Request (PR) is submitted that fully addresses the goals of this User Story. This issue is referenced in the PR.
• The CI-CD build process runs without any reported errors on the PR. This can be confirmed by reviewing that all checks have passed in the PR.

{The items above are general acceptance criteria for all User Stories. Please describe anything else that must be completed for this issue to be considered resolved.}

[wendellpiez]

There is WIP that addresses this issue in part, waiting behind a parked Issue (#186), in a working branch:

https://github.com/wendellpiez/metaschema/tree/feature-metaschema-relocation-plus-enhancementsA

It appears to be in conflict with develop: wendellpiez/metaschema@develop...feature-metaschema-relocation-plus-enhancementsA

@david-waltermire-nist any chance you could take a look?