Simpler readOnly field API

[chrisvxd]

Description

Consider replacing the readOnly functionality of resolveData with a dedicated readOnly API. The current readOnly API:

1. Requires convoluted dot-notation to set readOnly fields in arrays and objects
2. Pollutes the Data object

Considerations

• Should resolveData be renamed resolveProps?
• Could be folded into the resolveFields API, or perhaps this just provides a second way to implement
• Storing the readOnly data in the Data object was originally by design, to ensure that the resolver doesn't need to run on page load. However, resolvers now run on page load so this can be reconsidered.
• How can the API account for making a specific array index readOnly?

Proposals

Proposal 1

A boolean / function API

{
  type: "text",
  readOnly: (props) => {
    return !!props.someOtherValue;
  }
}

or

{
  type: "text",
  readOnly: true
}