[FIR plugin] Compile annotations in plugin sandbox to jvm and js

This is needed for further testing of plugins with JS backend

plugins/fir-plugin-prototype/fir-plugin-ic-test/build.gradle.kts

@@ -47,7 +47,7 @@ projectTest(parallel = true, jUnitMode = JUnitMode.JUnit4, maxHeapSizeMb = 3072)
     workingDir = rootDir
     useJUnitPlatform()
     dependsOn(":plugins:fir-plugin-prototype:jar")
-    dependsOn(":plugins:fir-plugin-prototype:plugin-annotations:jar")
+    dependsOn(":plugins:fir-plugin-prototype:plugin-annotations:distAnnotations")
 }
 
 testsJar()

plugins/fir-plugin-prototype/plugin-annotations/build.gradle.kts

@@ -1,10 +1,31 @@
 plugins {
-    kotlin("jvm")
-    id("jps-compatible")
+    kotlin("multiplatform")
 }
 
-dependencies {
-    api(kotlinStdlib())
+kotlin {
+    jvm()
+    js {
+        binaries.executable()
+    }
+
+    sourceSets {
+        val commonMain by getting {
+            dependencies {
+                implementation(kotlin("stdlib-common"))
+            }
+        }
+        val jvmMain by getting {
+            dependencies {1
+                implementation(kotlin("stdlib-jdk8"))
+            }
+        }
+
+        val jsMain by getting {
+            dependencies {
+                implementation(kotlin("stdlib-js"))
+            }
+        }
+    }
 }
 
 sourceSets {
@@ -12,4 +33,6 @@ sourceSets {
     "test" { none() }
 }
 
-runtimeJar()
+tasks.register("distAnnotations") {
+    dependsOn("jvmJar", "jsJar")
+}