Introduce 'common-configuration' convention plugin

This plugin should do project common configuration in the Kotlin repo.
As a first thing I moved gson version constraint into it, because
current approach has Gradle bug:
https://github.com/gradle/gradle/issues/20548

build.gradle.kts

@@ -1,7 +1,5 @@
-import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 import org.gradle.crypto.checksum.Checksum
 import org.gradle.plugins.ide.idea.model.IdeaModel
-import proguard.gradle.ProGuardTask
 
 buildscript {
     val cacheRedirectorEnabled = findProperty("cacheRedirectorEnabled")?.toString()?.toBoolean() == true
@@ -419,6 +417,7 @@ fun Task.listConfigurationContents(configName: String) {
 val ignoreTestFailures by extra(project.kotlinBuildProperties.ignoreTestFailures)
 
 allprojects {
+    pluginManager.apply("common-configuration")
     val mirrorRepo: String? = findProperty("maven.repository.mirror")?.toString()
 
     repositories {

buildSrc/src/main/kotlin/common-configuration.gradle.kts

@@ -0,0 +1,19 @@
+import gradle.kotlin.dsl.accessors._6fcc03dc3ac2d481a1d2799d95ed6983.implementation
+import org.gradle.kotlin.dsl.dependencies
+
+// Contains common configuration that should be applied to all projects
+
+// Forcing minimal gson dependency version
+val gsonVersion = rootProject.extra["versions.gson"] as String
+dependencies {
+    constraints {
+        configurations.all {
+            this@constraints.add(name, "com.google.code.gson:gson") {
+                version {
+                    require(gsonVersion)
+                }
+                because("Force using same gson version because of https://github.com/google/gson/pull/1991")
+            }
+        }
+    }
+}

settings.gradle

@@ -39,28 +39,6 @@ plugins {
     id "com.gradle.common-custom-user-data-gradle-plugin" version "1.6.5" apply false
 }
 
-File versionPropertiesFile = new File(rootProject.projectDir, "gradle/versions.properties")
-def versionProperties = new Properties()
-versionPropertiesFile.withInputStream {
-    versionProperties.load(it)
-}
-dependencyResolutionManagement {
-    components {
-        withModule("com.google.code.gson:gson") {
-            allVariants {
-                withDependencies {
-                   add("com.google.code.gson:gson") {
-                       version {
-                           it.require(versionProperties['versions.gson'])
-                       }
-                       because("Force using same gson version because of https://github.com/google/gson/pull/1991")
-                    }
-                }
-            }
-        }
-    }
-}
-
 def buildProperties = BuildPropertiesKt.getKotlinBuildPropertiesForSettings(settings)
 
 if (buildProperties.buildScanServer != null) {