Update controller class in package `rest-crud` when id is a required property

[jannyHou]

connect to https://github.com/strongloop/loopback-next/issues/2036 This is a follow-up story of PR https://github.com/strongloop/loopback-next/pull/3667. As a quick fix, that PR fixes the controller generator by adding a new prompt isIdOmitted, and creating the corresponding controller class differently.

There are two more improvements which need more time to address, so I open a new issue here.

Suggestion

Update the controller class in @loopback/rest-crud to reflect the id property's configuration.

Acceptance criteria

• [ ] Update the controller class in @loopback/rest-crud package, so that it generates the correct schema for id property. See discussion and discussion

[bajtos]

(Not sure is it a good idea to do them in one story, or should I create two?)

Let's create two stories please.

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