Jack Conradson 1b085252c3
[Painless] Add instance bindings (#34410)
This change adds instance bindings to Painless. This binding allows a whitelisted
 method to be called on an instance instantiated prior to script compilation. 
Whitelisting must be done in code as there is no practical way to instantiate a 
useful instance from a text file (see the tests for an example). Since an 
instance can be shared by multiple scripts, each method called must be 
thread-safe.
2018-10-24 12:57:28 -07:00
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