Issue #3137046 - Webform support

Adds a webform element that extends the OptionsBase element and uses the appropriate webform entity reference traits. Similar to the webform entity checkboxes element, but instead uses the checkbox tree element from this module.

Closes #3137046.

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• 7aada20e - Update based on the patch from comment #4

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• 5c7010f0 - Restore previous functioning as it didn't allow single values

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• a89ede17 - Remove setOptions method - this wasn't working

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• 5ce63512 - Remove dependency on self

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• 96128773 - Use injected entitytypemanager for loading vocabularies
• 513ad106 - Remove unneeded function

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• 5fe1ec9e - Set element #value_key to 'target_id' per TermReferenceTree widget
• 08434ef3 - Add function to get test values properly
• eae0bde5 - Add use statement to go with previous commit
• 51e707e6 - Setup the validation callback

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• d25ea02a - Add correct setOptions method (from patch #4)

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• 5b53df7b - Fix for when default value is empty

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