[FIR] Improve diagnostic reporting & don't use error symbol for candidate if possible

Also introduce few new diagnostics:
- NONE_APPLICABLE more many inapplicable candidates
- HIDDEN for visible candidates

compiler/testData/diagnostics/tests/extensions/kt1875.fir.kt

@@ -16,6 +16,6 @@ fun test(t: T) {
 fun test1(t: T?) {
     t.<!UNRESOLVED_REFERENCE!>f<!>(1) // todo resolve f as value and report UNSAFE_CALL
     t?.<!INAPPLICABLE_CANDIDATE!>f<!>(1)
-    t.<!INAPPLICABLE_CANDIDATE!>f<!>?.<!UNRESOLVED_REFERENCE!>invoke<!>(1)
+    t.<!INAPPLICABLE_CANDIDATE!>f<!>?.invoke(1)
     t?.f?.invoke(1)
 }