Introduce FirInitializerTypeMismatchChecker

compiler/testData/diagnostics/tests/generics/projectionsScope/kt7296.fir.kt

@@ -9,7 +9,7 @@ fun main() {
     val a : ArrayList<ArrayList<String>> = ArrayList()
     val b : ListOfLists<String> = ListOfLists(a)
     val c : ListOfLists<*> = b
-    val d : ArrayList<ArrayList<*>> = c.x
+    val d : ArrayList<ArrayList<*>> = <!INITIALIZER_TYPE_MISMATCH!>c.x<!>
 
     c.x checkType { <!INAPPLICABLE_CANDIDATE!>_<!><ArrayList<out ArrayList<*>>>() }
 }

compiler/testData/diagnostics/tests/generics/projectionsScope/typeMismatchInLambda.fir.kt

@@ -13,7 +13,7 @@ class A<E> {
 
 fun test(a: A<out CharSequence>, z: Out<CharSequence>) {
     a.foo {
-        val x: String = 1 // Should be no TYPE_MISMATCH_DUE_TO_TYPE_PROJECTIONS
+        val x: String = <!INITIALIZER_TYPE_MISMATCH!>1<!> // Should be no TYPE_MISMATCH_DUE_TO_TYPE_PROJECTIONS
         ""
     }
     a.bar { Out<CharSequence>() }