strongloop / loopback-next / 3972

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fix(context): fix optional param injection for methods

The following function has length of 0 as the param has a default value:
```
hello(@inject('user', {optional: true}) user: string = 'Mary')
```

Before this fix, the injected value for `user` is not used. The PR uses
decorations to help decide the real number of params.

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