feat: support relationship writes using objects instead of IDs

[r1tsuu]

What?

Previously, this code led to a validation error because movie is an object and you needed to use movie.id instead.

const movie = await payload.create({ collection: 'movies', data: {} })
const result = await payload.create({
  collection: 'object-writes',
  data: {
    many: [movie],
    manyPoly: [{ relationTo: 'movies', value: movie }],
    one: movie,
    onePoly: {
      relationTo: 'movies',
      value: movie,
    },
  },
})

While it's simple to modify this example, it's more painful when you have a data with depth > 0 and then you want to update that document.

Why?

Better DX as less checks needed, and TypeScript says that we can pass an object.

How?

Sanitizes the field value in the root beforeValidate hook

[github-actions]

🚀 This is included in version v3.0.0-beta.134