XGBoost MOJO should use Java predictor by default

Description

Java predictor is now well tested and proven to work well. We should use it as the default predictor for new MOJOs (should only apply to `gbtree`).

This will simplify deployment, make scoring faster and give users access to TreeSHAP by default.

Assignee

Michal Kurka

Fix versions

Reporter

Michal Kurka

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Priority

Major
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