Kapt: Allow to ignore specific methods/fields from being put into kapt stubs

Classes can't be ignored yet as it requires to ignore also all type usages which is a non-trivial operation.

plugins/kapt3/kapt3-compiler/testData/converter/ignoredMembers.kt

@@ -0,0 +1,13 @@
+import kotlinx.kapt.*
+
+class Test {
+    @KaptIgnored
+    fun ignoredFun() {}
+
+    @KaptIgnored @get:KaptIgnored
+    val ignoredProperty: String = ""
+
+    fun nonIgnoredFun() {}
+
+    val nonIgnoredProperty: String = ""
+}

plugins/kapt3/kapt3-compiler/testData/converter/ignoredMembers.txt

@@ -0,0 +1,17 @@
+@kotlin.Metadata()
+public final class Test {
+    @org.jetbrains.annotations.NotNull()
+    private final java.lang.String nonIgnoredProperty = "";
+
+    public final void nonIgnoredFun() {
+    }
+
+    @org.jetbrains.annotations.NotNull()
+    public final java.lang.String getNonIgnoredProperty() {
+        return null;
+    }
+
+    public Test() {
+        super();
+    }
+}