Add read and remove methods to ApplicationProperties

[mhalbritter]

I'd go with:

• @Nullable Object get(String key)
• @Nullable T get(String key, Class<T> clazz) which throws if it's the wrong type
• boolean contains(String key)
• boolean remove(String key) which returns true if something has been removed

See #1759 (comment)

[mhalbritter]

@eunseo9311 You expressed interest in the PR to work on that. Is that offer still valid?

[rodmibielli]

@mhalbritter I can work on this if you want.

[mhalbritter]

Please give @eunseo9311 until tomorrow to respond (it's a week then), and if we don't hear back until then, I'll assign the issue to you.

[mhalbritter]

Go ahead @rodmibielli , and thanks in advance.

[rodmibielli]

All right, today I will start to work on it. Rodrigo.

…

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