feat: add defaultPopulate property to collection config (#8934)

### What?
Adds `defaultPopulate` property to collection config that allows to
specify which fields to select when the collection is populated from
another document.
```ts
import type { CollectionConfig } from 'payload'

// The TSlug generic can be passed to have type safety for `defaultPopulate`.
// If avoided, the `defaultPopulate` type resolves to `SelectType`.
export const Pages: CollectionConfig<'pages'> = {
  slug: 'pages',
  // I need only slug, NOT the WHOLE CONTENT!
  defaultPopulate: {
    slug: true,
  },
  fields: [
    {
      name: 'slug',
      type: 'text',
      required: true,
    },
  ],
}
```

### Why?
This is essential for example in case of links. You don't need the whole
document, which can contain large data but only the `slug`.

### How?
Implements `defaultPopulate` when populating relationships, including
inside of lexical / slate rich text fields.

packages/richtext-slate/src/data/populate.ts

@@ -1,4 +1,4 @@
-import type { Collection, Field, PayloadRequest, RichTextField } from 'payload'
+import type { Collection, Field, PayloadRequest, RichTextField, SelectType } from 'payload'
 
 import { createDataloaderCacheKey } from 'payload'
 
@@ -13,6 +13,7 @@ type Arguments = {
   key: number | string
   overrideAccess?: boolean
   req: PayloadRequest
+  select?: SelectType
   showHiddenFields: boolean
 }
 
@@ -26,6 +27,7 @@ export const populate = async ({
   key,
   overrideAccess,
   req,
+  select,
   showHiddenFields,
 }: {
   collection: Collection
@@ -44,6 +46,7 @@ export const populate = async ({
       fallbackLocale: req.locale,
       locale: req.fallbackLocale,
       overrideAccess: typeof overrideAccess === 'undefined' ? false : overrideAccess,
+      select,
       showHiddenFields,
       transactionID: req.transactionID,
     }),

packages/richtext-slate/src/data/recurseNestedFields.ts

@@ -48,6 +48,7 @@ export const recurseNestedFields = ({
                     key: i,
                     overrideAccess,
                     req,
+                    select: collection.config.defaultPopulate,
                     showHiddenFields,
                   }),
                 )
@@ -69,6 +70,7 @@ export const recurseNestedFields = ({
                     key: i,
                     overrideAccess,
                     req,
+                    select: collection.config.defaultPopulate,
                     showHiddenFields,
                   }),
                 )
@@ -94,6 +96,7 @@ export const recurseNestedFields = ({
                 key: 'value',
                 overrideAccess,
                 req,
+                select: collection.config.defaultPopulate,
                 showHiddenFields,
               }),
             )
@@ -114,6 +117,7 @@ export const recurseNestedFields = ({
             key: field.name,
             overrideAccess,
             req,
+            select: collection.config.defaultPopulate,
             showHiddenFields,
           }),
         )

packages/richtext-slate/src/data/richTextRelationshipPromise.ts

@@ -54,6 +54,7 @@ export const recurseRichText = ({
               key: 'value',
               overrideAccess,
               req,
+              select: collection.config.defaultPopulate,
               showHiddenFields,
             }),
           )
@@ -93,6 +94,7 @@ export const recurseRichText = ({
                 key: 'value',
                 overrideAccess,
                 req,
+                select: collection.config.defaultPopulate,
                 showHiddenFields,
               }),
             )