Allow use of `@JsonIgnoreProperties` for POJO-valued arrays, `Collection`s

[cowtowncoder]

Currently it is possible to use @JsonIgnoreProperties not only on classes, but also on POJO-valued properties. If so, ignorals are combined with ones that class itself may have.

This can not, however, be used for Collections or arrays, as they have no properties to ignore. But if collection/map contents are POJOs, it would semantically make sense to allow usage for value type (elements), if possible.

It might also make sense to allow similar approach for Map values, but there is the problem with ambiguity, as Map keys can be considered properties, and currently functionality does support ignoral.

[cowtowncoder]

And in fact I think this actually already works for Maps, ignoring entries as annotated. So it'd only work on arrays, Collections.

[cowtowncoder]

Interesting. Should have actually tested earlier, but this DOES work at least on 2.9.
So: @JsonIgnoreProperties annotation on Collection or array-valued property should work, as long as POJO type is declared. So no further work needed. If there are gaps please report as new issues.