[FIR] Support FIR version of all-open plugin

compiler/testData/cli/jvm/firAllOpenPlugin.args

@@ -0,0 +1,6 @@
+-d
+$TEMP_DIR$
+-Xplugin=dist/kotlinc/lib/allopen-compiler-plugin.jar
+-P
+plugin\:org.jetbrains.kotlin.allopen\:annotation=foo.AllOpen
+$TESTDATA_DIR$/firAllOpenPlugin.kt

compiler/testData/cli/jvm/firAllOpenPlugin.kt

@@ -0,0 +1,14 @@
+package foo
+
+annotation class AllOpen
+
+@AllOpen
+class Base {
+    fun method() {}
+    val property = "hello"
+}
+
+class Derived : Base() {
+    override fun method() {}
+    override val property = "world"
+}

compiler/testData/cli/jvm/firAllOpenPlugin.out

@@ -0,0 +1 @@
+OK