Rework of https://github.com/payloadcms/payload/pull/5912
### What?
Now, when `defaultValue` is defined as function you can receive the
`req` argument:
```ts
{
name: 'defaultValueFromReq',
type: 'text',
defaultValue: async ({ req, user, locale }) => {
return Promise.resolve(req.context.defaultValue)
},
},
```
`user` and `locale` even though are repeated in `req`, this potentially
leaves some room to add more args in the future without removing them
now.
This also improves type for `defaultValue`:
```ts
type SerializableValue = boolean | number | object | string
export type DefaultValue =
| ((args: {
locale?: TypedLocale
req: PayloadRequest
user: PayloadRequest['user']
}) => SerializableValue)
| SerializableValue
```
### Why?
To access the current URL / search params / Local API and other things
directly in `defaultValue`.
### How?
Passes `req` through everywhere where we call `defaultValue()`
6dea111d28