Effects: add diagnostic tests on contracts

- Make AbstractDiagnosticsTest dump function contracts
- Add diagnostics tests on parsing contracts
- Add diagnostics tests on smartcats in presence of functions with
contracts
- Add diagnostics tests on initialization and flow in presence of
in-place called lambdas

==========
Introduction of EffectSystem: 16/18

compiler/testData/diagnostics/testsWithStdLib/contracts/smartcasts/throwsEffect.txt

@@ -0,0 +1,12 @@
+package
+
+public fun myAssert(/*0*/ condition: kotlin.Boolean): kotlin.Unit
+    Returns(WILDCARD) -> condition
+
+public fun testAssertInIf(/*0*/ x: kotlin.Any?): kotlin.Unit
+public fun testAssertSmartcast(/*0*/ x: kotlin.Any?): kotlin.Unit
+public fun testAtLeastOnceFlow(/*0*/ x: kotlin.Any?): kotlin.Unit
+public fun testInvertedAssert(/*0*/ x: kotlin.Any?): kotlin.Unit
+public fun testSpilling(/*0*/ x: kotlin.Any?): kotlin.Unit
+public fun testTryCatch(/*0*/ x: kotlin.Any?): kotlin.Unit
+public fun testUncertainFlow(/*0*/ x: kotlin.Any?): kotlin.Unit