Model level scope: include is not supported in LB4

### Describe the bug

In Loopback 3 it was possible to add a scope and include in model annotations on a model class :

`@model({
settings: {
strict: false,
scope: {
include: [
{relation: 'posts'}
]
}
})
`
If you do the same in LB4 an error is thrown that the relation cannot be found as loopback-datasource-juggler does not support LB4 includes.

I have made changes to support model level includes here:

https://github.com/SilexConsulting/loopback-next/tree/support-default-scope-include

I need some help to get this ready to submit a pull request.

### Logs

_No response_

### Additional information

_No response_

### Reproduction

https://github.com/SilexConsulting/loopback-next/tree/support-default-scope-include

Start by reviewing the support-default-scope-include branch and its reproduction in the linked LoopBack 4 repository, focusing on model annotations and loopback-datasource-juggler's handling of includes. Confirm the model-level scope include no longer raises a relation-not-found error and that the reproduced behavior works as expected.

Written by the indexing model from the issue text.