Convert evaluator interface to function

libraries/scripting/common/src/kotlin/script/experimental/api/scriptEvaluation.kt

@@ -26,9 +26,7 @@ data class EvaluationResult(val returnValue: Any?, val environment: ScriptEvalua
 
 interface ScriptEvaluator {
 
-    // constructor(properties: ScriptDefinitionPropertiesBag) // the constructor is expected from implementations
-
-    suspend fun eval(
+    suspend operator fun invoke(
         compiledScript: CompiledScript<*>,
         scriptEvaluationEnvironment: ScriptEvaluationEnvironment
     ): ResultWithDiagnostics<EvaluationResult>

libraries/scripting/common/src/kotlin/script/experimental/host/BasicScriptingHost.kt

@@ -40,7 +40,7 @@ abstract class BasicScriptingHost(
             when (compiled) {
                 is ResultWithDiagnostics.Failure -> compiled
                 is ResultWithDiagnostics.Success -> {
-                    evaluator.eval(compiled.value, environment)
+                    evaluator(compiled.value, environment)
                 }
             }
         }

libraries/scripting/jvm/src/kotlin/script/experimental/jvm/runners/BasicJvmScriptEvaluator.kt

@@ -9,7 +9,7 @@ import kotlin.script.experimental.api.*
 
 open class BasicJvmScriptEvaluator() : ScriptEvaluator {
 
-    override suspend fun eval(
+    override suspend operator fun invoke(
         compiledScript: CompiledScript<*>,
         scriptEvaluationEnvironment: ScriptEvaluationEnvironment
     ): ResultWithDiagnostics<EvaluationResult> =