feat: add populate property to Local / REST API

[r1tsuu]

What?

Adds populate property to Local API and REST API operations that can be used to specify select for a specific collection when it's populated

const result = await payload.findByID({
  populate: {
   // type safe if you have generated types
    posts: {
      text: true,
    },
  },
  collection: 'pages',
  depth: 1,
  id: aboutPage.id,
})

result.relatedPost // only has text and id properties

fetch('https://localhost:3000/api/pages?populate[posts][text]=true') // highlight-line
  .then((res) => res.json())
  .then((data) => console.log(data))

It also overrides defaultPopulate

Ensures defaultPopulate doesn't affect GraphQL.

How?

Implements the property for all operations that have the depth argument.

[DanRibbens]

Looks good!
In my review I was checking that this doesn't impact the data loader, it seems like it will work well. Each collection can only have one definition of select so no issues.

[github-actions]

🚀 This is included in version v3.0.0-beta.126