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/callsEffect.kt

@@ -0,0 +1,24 @@
+// LANGUAGE_VERSION: 1.3
+@file:Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
+
+package test
+
+import kotlin.internal.contracts.*
+
+fun <X, Y, Z, R> callsEffectWithKind(block: (X, Y, Z) -> R) {
+    contract {
+        callsInPlace(block, InvocationKind.EXACTLY_ONCE)
+    }
+}
+
+inline fun callsEffectImplicitUnknown(x: Int, y: Int, block: () -> Unit) {
+    contract {
+        callsInPlace(block)
+    }
+}
+
+inline fun callsEffectExplicitUnknown(x: Int, block: () -> Unit) {
+    contract {
+        callsInPlace(block, InvocationKind.UNKNOWN)
+    }
+}