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/logicOperators.kt

@@ -0,0 +1,22 @@
+// LANGUAGE_VERSION: 1.3
+@file:Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
+
+package test
+
+import kotlin.internal.contracts.*
+
+
+fun orSequence(x: Any?, y: Any?, b: Boolean) {
+    contract {
+        returns() implies (x is String || y is Int || !b)
+    }
+}
+
+class A
+class B
+
+fun andSequence(x: Any?, y: Any?, b:Boolean) {
+    contract {
+        returns() implies (x is A && x is B && ((y is A) && b))
+    }
+}