Provide a DSL for publication settings (#1869)

* Provide a DSL for publication settings
* Rename DSL method publication -> mavenPublication
* Fix gradle task input/output validation

 #KT-26771 fixed.

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/NewMultiplatformIT.kt

@@ -58,6 +58,14 @@ class NewMultiplatformIT : BaseGradleIT() {
                     Assert.assertTrue("$it should exist", groupDir.resolve(it).exists())
                 }
 
+                listOf(jvmJarName, jsJarName, metadataJarName, wasmKlibName, nativeKlibName).forEach {
+                    val pom = groupDir.resolve(it.replaceAfterLast('.', "pom"))
+                    Assert.assertTrue(
+                        "$pom should contain a name section.",
+                        pom.readText().contains("<name>Sample MPP library</name>")
+                    )
+                }
+
                 val jvmJarEntries = ZipFile(groupDir.resolve(jvmJarName)).entries().asSequence().map { it.name }.toSet()
                 Assert.assertTrue("com/example/lib/CommonKt.class" in jvmJarEntries)
                 Assert.assertTrue("com/example/lib/MainKt.class" in jvmJarEntries)

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/new-mpp-lib-and-app/sample-lib/build.gradle

@@ -27,7 +27,16 @@ kotlin {
         fromPreset(presets.linuxX64, 'linux64')
         fromPreset(presets.mingwX64, 'mingw64')
         fromPreset(presets.macosX64, 'macos64')
+
+        all {
+            mavenPublication {
+                pom.withXml {
+                    asNode().appendNode('name', 'Sample MPP library')
+                }
+            }
+        }
     }
+
     sourceSets {
         jvm6Main {
             dependencies {