[PL] Introduce new CLI parameter: -Xpartial-linkage-loglevel

The parameter controls the level of logs produced during the compile time by the partial linkage: 'info', 'warn' (default for now), and 'error'.

compiler/util/src/org/jetbrains/kotlin/config/PartialLinkageLogLevel.kt

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.config
+
+enum class PartialLinkageLogLevel {
+    INFO, WARNING, ERROR;
+
+    companion object {
+        val DEFAULT = WARNING
+
+        fun resolveLogLevel(key: String): PartialLinkageLogLevel = when (key.uppercase()) {
+            "INFO" -> INFO
+            "WARNING" -> WARNING
+            "ERROR" -> ERROR
+            else -> error("Unknown partial linkage compile-time log level '$key'")
+        }
+    }
+}