Kotlin: Log our verbosity level

This happens at `info` level, which is logged by default.

java/kotlin-extractor/src/main/kotlin/KotlinExtractorExtension.kt

@@ -140,6 +140,7 @@ class KotlinExtractorExtension(
             val logger = Logger(loggerBase, tw)
             logger.info("Extraction started")
             logger.flush()
+            logger.infoVerbosity()
             logger.info("Extraction for invocation TRAP file $invocationTrapFile")
             logger.flush()
             logger.info("Kotlin version ${KotlinCompilerVersion.getVersion()}")

java/kotlin-extractor/src/main/kotlin/utils/Logger.kt

@@ -244,6 +244,10 @@ open class LoggerBase(val logCounter: LogCounter) {
         }
     }
 
+    fun infoVerbosity(dtw: DiagnosticTrapWriter) {
+        info(dtw, "Kotlin extractor verbosity is " + verbosity.toString())
+    }
+
     fun warn(dtw: DiagnosticTrapWriter, msg: String, extraInfo: String?) {
         if (verbosity >= 2) {
             diagnostic(dtw, Severity.Warn, msg, extraInfo)
@@ -301,6 +305,10 @@ open class Logger(val loggerBase: LoggerBase, val dtw: DiagnosticTrapWriter) {
         loggerBase.info(dtw, msg)
     }
 
+    fun infoVerbosity() {
+        loggerBase.infoVerbosity(dtw)
+    }
+
     private fun warn(msg: String, extraInfo: String?) {
         loggerBase.warn(dtw, msg, extraInfo)
     }