Change group of kotlinx.metadata to org.jetbrains.kotlinx

Allow to override version of the resulting artifact with a property.
Setup publishing of the library when its deployment version is specified.

libraries/kotlinx-metadata/jvm/build.gradle.kts

@@ -6,8 +6,19 @@ plugins {
     kotlin("jvm")
 }
 
-// Change this version before publishing
-version = "0.1-SNAPSHOT"
+/*
+ * To publish this library use `:kotlinx-metadata-jvm:publish` task and specify the following parameters
+ *
+ *      - `-PdeployVersion=1.2.nn`: the version of the standard library dependency to put into .pom
+ *      - `-PkotlinxMetadataDeployVersion=0.0.n`: the version of the library itself
+ *      - `-PdeployRepoUrl=repository_url`: (optional) the url of repository to deploy to;
+ *          if not specified, the local directory repository `build/repo` will be used
+ *      - `-PdeployRepoUsername=username`: (optional) the username to authenticate in the deployment repository
+ *      - `-PdeployRepoPassword=password`: (optional) the password to authenticate in the deployment repository
+ */
+group = "org.jetbrains.kotlinx"
+val deployVersion = findProperty("kotlinxMetadataDeployVersion") as String?
+version = deployVersion ?: "0.1-SNAPSHOT"
 
 sourceSets {
     "main" { projectDefault() }
@@ -59,7 +70,10 @@ sourcesJar {
 }
 
 javadocJar()
-// publish()
+
+if (deployVersion != null) {
+    publish()
+}
 
 projectTest {
     workingDir = rootDir