CDC #237 - Image Upload

[dleadbetter]

This pull request makes the following changes:

• Adds the errors, itemComponentProps, and onValidate props to the FileUploadModal component
• Adds the fields and required props to the UserDefinedFieldsForm component
  • If the fields prop is provided, an additional API call to load the fields will not be executed
  • If the required prop is provided, only required fields will be displayed on the form