Allow cloud validator `fields` to be key value pairs

[dblythy]

New Feature / Enhancement Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.

Current Limitation

The cloud validator option fields accepts either an array of strings which have no implict types, or an object that has .type.

Feature / Enhancement Description

Add option for fields to be an object, with key value pairs, where the key is the field, and the value is the type. Such as:

fields: {
  data: Array,
},

Example Use Case

Alternatives / Workarounds

3rd Party References

[parse-github-assistant]

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