Integrate serialization plugin into big Kotlin plugin

Split import handlers into multiple files
Add empty Maven handler for Android Studio

Add testRuntime dependency on kx-serialization-plugin for all modules which require compiler
plugins in test classpath

idea/idea-maven/build.gradle.kts

@@ -37,6 +37,7 @@ dependencies {
     testRuntime(project(":allopen-ide-plugin"))
     testRuntime(project(":noarg-ide-plugin"))
     testRuntime(project(":kotlin-scripting-idea"))
+    testRuntime(project(":kotlinx-serialization-compiler-plugin"))
 
     testRuntime(intellijDep())
     // TODO: the order of the plugins matters here, consider avoiding order-dependency

idea/idea-maven/build.gradle.kts.173

@@ -37,6 +37,7 @@ dependencies {
     testRuntime(project(":allopen-ide-plugin"))
     testRuntime(project(":noarg-ide-plugin"))
     testRuntime(project(":kotlin-scripting-idea"))
+    testRuntime(project(":kotlinx-serialization-compiler-plugin"))
 
     testRuntime(intellijDep())
     // TODO: the order of the plugins matters here, consider avoiding order-dependency

idea/idea-maven/build.gradle.kts.as31

@@ -37,6 +37,7 @@ dependencies {
     testRuntime(project(":allopen-ide-plugin"))
     testRuntime(project(":noarg-ide-plugin"))
     testRuntime(project(":kotlin-scripting-idea"))
+    testRuntime(project(":kotlinx-serialization-compiler-plugin"))
 
     testRuntime(intellijDep())
     // TODO: the order of the plugins matters here, consider avoiding order-dependency

idea/idea-maven/build.gradle.kts.as32

@@ -37,6 +37,7 @@ dependencies {
     testRuntime(project(":allopen-ide-plugin"))
     testRuntime(project(":noarg-ide-plugin"))
     testRuntime(project(":kotlin-scripting-idea"))
+    testRuntime(project(":kotlinx-serialization-compiler-plugin"))
 
     testRuntime(intellijDep())
     // TODO: the order of the plugins matters here, consider avoiding order-dependency

idea/idea-maven/build.gradle.kts.as33

@@ -37,6 +37,7 @@ dependencies {
     testRuntime(project(":allopen-ide-plugin"))
     testRuntime(project(":noarg-ide-plugin"))
     testRuntime(project(":kotlin-scripting-idea"))
+    testRuntime(project(":kotlinx-serialization-compiler-plugin"))
 
     testRuntime(intellijDep())
     // TODO: the order of the plugins matters here, consider avoiding order-dependency