eval should sometimes make an entry in the ENGINE_SCOPE bindings

[mslinn]

scripting-scala's eval function does not quite match the JSR233 implementations for Nashorn and Jython. Specifically, eval should make an entry in the ScriptContext.ENGINE_SCOPE bindings whenever it receives a string that causes a new variable or method to be defined.

For example, this should cause a new variable called twelve to be defined:

eval("val twelve = 12")

I exercise several JSR233 implementations in a test suite here, and highlight this issue here.

The scripting-java and scripting-clojure projects probably suffer from the same bug.

[jpsacha]

Implementations moved recently to Scala 3 and its implementation of the Script Engine. That implementation currently has no support for bindings (scala/scala3#17237). However, the bindings are emulated in the new ScalaAdaptedScriptEngine.

I added a test to verify the the issue reported here was addressed:

scripting-scala/src/test/java/org/scijava/plugins/scripting/scala/ScalaTest.java

Line 274 in 33f3b1b

public void issue5() {