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Fix #219

Notes

Adds middleware for translating group logic into a flat structure that fielder can understand.

// Inside a Fielder context
const GroupExample = () => {
  const group = useFieldGroup();

  return (
    <FieldGroupProvider value={group}>
      <Child />
      <Child />
      <Child />
    </FieldGroupProvider>
  );
}

const Child = () => {
  const [fieldProps, fieldMeta] = useField({ name: '1234' }) // Same API

  //...
}

Todo

• Add group validation function which executes validation argument to useFieldGroup and also throws errors if any errors exist in the field group state (blocked by Changes to validation arg doesn't update validation function #235).
• Update mountField fns in all contexts to return name of field
• Add useFieldGroupContext() || useFormContext() logic to useField
• Add example
• Add documentation