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/deeplyNestedExpression.txt

@@ -0,0 +1,8 @@
+package test
+
+public fun deeplyNested(/*0*/ x: kotlin.Any?, /*1*/ y: kotlin.Any?, /*2*/ b: kotlin.Boolean, /*3*/ s: kotlin.String?): kotlin.Unit
+    Returns(TRUE) -> ((x is Int && x is String) || (x is Int && y is A) || b || (!b)) && s != null && (y is A || x is String)
+
+public final class A {
+    /*primary*/ public constructor A()
+}