create OneOfEnumCell for select inputs

[edkahara]

Context: https://jsonforms.discourse.group/t/oneof-not-producing-select-field-or-multiple-choice-checklist-in-vanilla-renderers/2574

1. Create and export OneOfEnumCell cell that creates select inputs in vanella-renderers.
2. Adds hideEmptyOption that when true, removes the empty option so the select input only has the options the user passes in oneOf

[CLAassistant]

All committers have signed the CLA.

[netlify]

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[lucas-koehler]

Hi @edkahara , thank you for the contribution ❤️

Please note that you need to sign the contributor license agreement (CLA) before we can accept your contribution. See this comment: #2414 (comment)

[lucas-koehler]

Hi @edkahara ,

Thanks again for the contribution! The code already looks pretty good to me. I just have one tiny suggestion for a comment.

Could you please add some tests for the new renderer? We try to have at least rudimentary unit tests for all renderers. You can use https://github.com/eclipsesource/jsonforms/blob/master/packages/vanilla-renderers/test/renderers/EnumCell.test.tsx as a starting point for this.

[edkahara]

@lucas-koehler Is there any other change required?

[coveralls]

coverage: 82.517% (+0.01%) from 82.504%
when pulling 4229c93 on edkahara:vanilla-renderers/select
into 903cef7 on eclipsesource:master.

[lucas-koehler]

Hi @edkahara thanks again for the contribution and adding these extensive tests ❤️

The code now looks good to me!
Building the example app fails here. However, this is not caused by this PR and building and testing it locally worked fine. Thus, we can still merge this :)