Preliminary declaration visitor for estimating local variable's predictability for smart casts

Predictability estimation algorithm is completely new, but backward compatibility should present.
A large set of tests. Some updated tests.
Smart casts allowed for captured variables if they are not modified in closure #KT-9051 Fixed
Also #KT-8643 Fixed
Also #KT-7976 Fixed
Correct handling of lambda arguments in functions #KT-9143 Fixed

compiler/testData/diagnostics/testsWithStdLib/smartcasts/lazyDeclaresAndModifies.kt

@@ -0,0 +1,11 @@
+class My(val x: Int?) {
+    val y: Int? by lazy {
+        var z = x
+        while (z != null) {
+            z = <!DEBUG_INFO_SMARTCAST!>z<!>.hashCode()
+            if (<!DEBUG_INFO_SMARTCAST!>z<!> < 0) return@lazy z
+            if (z == 0) z = null
+        }
+        return@lazy null
+    }
+}