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/embedding.txt

@@ -0,0 +1,13 @@
+package test
+
+public fun embedInstancePredicate(/*0*/ x: kotlin.Any, /*1*/ y: kotlin.Any?): kotlin.Unit
+    Returns(WILDCARD) -> x is String && y is String
+
+public fun embedNullCheckPredicate(/*0*/ x: kotlin.Any?, /*1*/ y: kotlin.Int?): kotlin.Unit
+    Returns(WILDCARD) -> y != null && x is String
+
+public fun embedVariable(/*0*/ x: kotlin.Any, /*1*/ b: kotlin.Boolean): kotlin.Unit
+    Returns(WILDCARD) -> b && x is String
+
+public fun kotlin.Boolean.embedReceiverReference(/*0*/ b: kotlin.Boolean): kotlin.Unit
+    Returns(WILDCARD) -> (!<this>) && b