FIR: check assignments and references to members in constructors

I.e. emit VAL_REASSIGNMENT on repeated assignments to `this.something`,
UNINITIALIZED_VARIABLE on reads of it before any assignment if there is
no initializer, and CAPTURED_MEMBER_VAL_INITIALIZATION on assignments
inside non-called-in-place functions and named classes.

^KT-55528 Fixed

compiler/testData/diagnostics/tests/controlFlowAnalysis/initializationInLocalClass.fir.kt

@@ -27,7 +27,7 @@ fun gav() {
     class B {
         init {
             // Error! See KT-10445
-            x = ""
+            <!CAPTURED_VAL_INITIALIZATION!>x<!> = ""
         }
     }
     // Error! See KT-10042
@@ -36,7 +36,7 @@ fun gav() {
     class C(val s: String) {
         constructor(): this("") {
             // Error!
-            y = s
+            <!CAPTURED_VAL_INITIALIZATION!>y<!> = s
         }
     }
     <!UNINITIALIZED_VARIABLE!>y<!>.length
@@ -77,7 +77,7 @@ class My {
         class Your {
             init {
                 // Error! See KT-10445
-                x = ""
+                <!CAPTURED_VAL_INITIALIZATION!>x<!> = ""
             }
         }
     }