feat(lb3-compat): Loopback3 compatibilty extension/package

[derdeka]

Suggestion

I suggest to create a @loopback/lb3-compat package to reimplement the builtin lb3 models and behavior with lb4 components like interceptors etc.

Use Cases

To support lb3 migrations it might be helpful to rebuild the lb3 behavior and models in lb4 for a faster migration path for exisiting applications. It does not make sense that each user needs to do this by going through the docs.

This could be also helpful for importing lb3 models into lb4. Relates to #4737.

Acceptance criteria

TBD - will be filled by the team.

[dhmlau]

@derdeka, thanks for your suggestion. For the built-in LB3 models, do you mean User and ACL models? @jannyHou is creating a extension/component for JWT authentication, so whoever trying to use JWT authentication in LB doesn't need to follow the same steps. :). See #4903. Is that something you have in mind?

The benefit of having such extension is that it would benefit not only LB3 users who are migrating their application to LB4, but also someone who is building LB4 app from scratch.

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