strongloop / loopback-next / 2312

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fix(context): inject nested properties (#587)

Fix the implementation of `@inject` resolver to correctly support
nested properties.

Simplify the implementation of nested properties to avoid edge cases
that are difficult to support:

 - All Context methods creating/returning full Binding instances require
   a key without property-path suffix.

 - Only `get` and `getSync`, which are (eventually) returning the bound
   value only, allow property-path suffix.

 - A new method `getValueOrPromise` is introduced, this is an internal
   method shared between `get`, `getSync` and
   `@inject` (`instantiateClass`). This method supports keys with
   property-path suffix too.

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