[Compiler] Mark all entrypoints to compiler API as experimental

plugins/parcelize/parcelize-compiler/build.gradle.kts

@@ -61,6 +61,8 @@ dependencies {
     layoutLibApi("com.android.tools.layoutlib:layoutlib-api:26.5.0") { isTransitive = false }
 }
 
+optInToExperimentalCompilerApi()
+
 sourceSets {
     "main" { none() }
     "test" {

plugins/parcelize/parcelize-compiler/parcelize.cli/build.gradle.kts

@@ -23,6 +23,8 @@ sourceSets {
     "test" { none() }
 }
 
+optInToExperimentalCompilerApi()
+
 runtimeJar()
 javadocJar()
 sourcesJar()