Effects: add test on (de)serialization of contracts

- Add ContractDescriptorRenderer
- Add option to dump function contracts in DescriptorRendererOptions
- Add parsing of LANGUAGE_VERSION directive in AbstractLoadJava
- Add tests on serialization-deserializaton identity of contracts

==========
Introduction of EffectSystem: 13/18

compiler/testData/loadJava/compiledKotlinWithStdlib/contracts/isInstancePredicate.txt

@@ -0,0 +1,11 @@
+package test
+
+public fun simpleIsInstace(/*0*/ x: kotlin.Any?): kotlin.Unit
+    Returns(TRUE) -> x is A
+
+public fun kotlin.Any?.receiverIsInstance(): kotlin.Unit
+    Returns(TRUE) -> <this> is A
+
+public final class A {
+    /*primary*/ public constructor A()
+}