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/controlflow/flowInlining/tryCatchFinally.kt

@@ -0,0 +1,33 @@
+// !LANGUAGE: +CallsInPlaceEffect
+// !DIAGNOSTICS: -INVISIBLE_REFERENCE -INVISIBLE_MEMBER -UNUSED_PARAMETER
+
+import kotlin.internal.contracts.*
+
+inline fun <T> myRun(block: () -> T): T {
+    contract {
+        callsInPlace(block, InvocationKind.EXACTLY_ONCE)
+    }
+    return block()
+}
+
+fun someComputation(): Int = 42
+
+fun report(x: Int) = Unit
+
+fun innerTryCatchFinally() {
+    val x: Int
+
+    myRun {
+        try {
+            x = someComputation()
+            report(x)
+        } catch (e: java.lang.Exception) {
+            <!VAL_REASSIGNMENT!>x<!> = 42
+            report(x)
+        } finally {
+            x = 0
+        }
+    }
+
+    x.inc()
+}