Add material3, mark some libraries as Experiemental (#1390)

Checked it on the version 0.0.0-feature-material3-build460

Fixes https://github.com/JetBrains/compose-jb/issues/1335

compose/build.gradle.kts

@@ -32,6 +32,7 @@ tasks.register("publishComposeJb") {
         ":compose:foundation:foundation",
         ":compose:foundation:foundation-layout",
         ":compose:material:material",
+        ":compose:material3:material3",
         ":compose:material:material-icons-core",
         ":compose:material:material-ripple",
         ":compose:runtime:runtime",

gradle-plugins/compose/src/main/kotlin/org/jetbrains/compose/ComposePlugin.kt

@@ -159,8 +159,11 @@ class ComposePlugin : Plugin<Project> {
         val animation get() = composeDependency("org.jetbrains.compose.animation:animation")
         val foundation get() = composeDependency("org.jetbrains.compose.foundation:foundation")
         val material get() = composeDependency("org.jetbrains.compose.material:material")
+        @ExperimentalComposeLibrary
+        val material3 get() = composeDependency("org.jetbrains.compose.material3:material3")
         val runtime get() = composeDependency("org.jetbrains.compose.runtime:runtime")
         val ui get() = composeDependency("org.jetbrains.compose.ui:ui")
+        @ExperimentalComposeLibrary
         val uiTestJUnit4 get() = composeDependency("org.jetbrains.compose.ui:ui-test-junit4")
         val uiTooling get() = composeDependency("org.jetbrains.compose.ui:ui-tooling")
         val preview get() = composeDependency("org.jetbrains.compose.ui:ui-tooling-preview")
@@ -186,6 +189,7 @@ class ComposePlugin : Plugin<Project> {
     }
 
     object DesktopComponentsDependencies {
+        @ExperimentalComposeLibrary
         val splitPane = composeDependency("org.jetbrains.compose.components:components-splitpane")
     }
 

gradle-plugins/compose/src/main/kotlin/org/jetbrains/compose/ExperimentalComposeLibrary.kt

@@ -0,0 +1,5 @@
+package org.jetbrains.compose
+
+// We write explicitly about OptIn, because IDEA doesn't suggest it.
+@RequiresOptIn("This library is experimental and can be unstable. Add @OptIn(org.jetbrains.compose.ExperimentalComposeLibrary::class) annotation.")
+annotation class ExperimentalComposeLibrary