* [Spacetime] Reimplement config Setting classe in java (#15679)
Reimplement the root Ruby Setting class in Java and use it from the Ruby one moving the original Ruby class to a shell wrapping the Java instance.
In particular create a new symmetric hierarchy (at the time just for `Setting`, `Coercible` and `Boolean` classes) to the Ruby one, moving also the feature for setting deprecation. In this way the new `org.logstash.settings.Boolean` is syntactically and semantically equivalent to the old Ruby Boolean class, which replaces.
(cherry picked from commit 61de60fe26)
* Adds supress warnings related to this-escape for Java Settings classes
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Co-authored-by: Andrea Selva <selva.andre@gmail.com>
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