edtf format validator

[retorquere]

Description

Adds edtf format validator library for 4 json-schema validators (example of use in test)

Fixes #421

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• Variable addition (adds a new variable or type string)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• I have installed the repo pre-commit hook; if not, and I have modified any of the schema files, I have run trang and/or prettier on the files, per CONTRIBUTING
• I have performed a self-review of my own code
• I have included suggested corresponding changes to the documentation (if relevant)

I am not sure where this should be documented.

[bdarcus]

Do I understand #421 (comment) correctly, @retorquere: are you moving most of this to an EDTF.js PR, and reducing this to examples for the test script?

So I'll wait for that to merge, and you to update this?

[retorquere]

Do I understand #421 (comment) correctly, @retorquere: are you moving most of this to an EDTF.js PR, and reducing this to examples for the test script?

So I'll wait for that to merge, and you to update this?

Yeah that seems best.

[bdarcus]

OK.

BTW, I think we would merge this to the 1.1 branch.