Model: hidden property shortcut

[hacksparrow]

Currently, to hide properties of a model we have to do this:

@model({
  settings: {
    hiddenProperties: ['password']
  }
})
class MyUserModel extends Entity {
  ...
   @property({type: 'string'})
  password: string;
  ...
}

Let's provide a shortcut so we can do this instead:

class MyUserModel extends Entity {
  ...
   @property({type: 'string', hidden: true})
  password: string;
  ...
}

Acceptance Criteria

• Add new property hidden in model property definitions, which should do what hiddenProperties does for the listed properties.
• Update relevant documentation

Along with #2766, users will now have a more intuitive model definition experience.

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[bajtos]

The benefit of the current model-level design is that child models can hide properties defined in the parent model. I think it is a useful feature we should preserve.

Adding support for property-level hidden metadata as an alternate syntax to model-level hiddenProperties looks reasonable to me 👍🏻

[mdbetancourt]

i would like to take this one

[hacksparrow]

@mdbetancourt great!