Using a resource route to fill default values

[gregermendle]

Hey!

I'd like to put my setFormDefaults logic with my action logic for some of the forms i'm building. I was thinking something along the lines of:

1. A loader can return setFormDefaults on the same route the action is defined on
2. Remix validated form would then consider the action prop route when checking for form defaults

For example:

// my.action.ts
// defines both the action for saving data as well as a loader to setting defaults
export const loader = () => {
  return json(setFormDefaults("myForm", { someField: "abcd" }))
}

export const action = () => {...}

// myForm.tsx
// ValidatedForm will check matches as well as the action route for default values
<ValidatedForm name="myForm" action="/my/action" validator={...} />

Willing to PR if this seems like a good idea!