[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/j+k/sam/privateCandidatesWithWrongArguments.fir.kt

@@ -17,5 +17,5 @@ public class A {
 package bar
 
 fun main() {
-    foo.A.<!INAPPLICABLE_CANDIDATE!>f<!> {}
-}
+    foo.A.<!HIDDEN!>f<!> {}
+}

compiler/testData/diagnostics/tests/j+k/sam/referenceToSamFunctionAgainstExpectedType.fir.kt

@@ -18,7 +18,7 @@ public class Inv<T> {
 
 fun test(inv: Inv<String>) {
     val m: ((String) -> String) -> Inv<String> = inv::map
-    <!INAPPLICABLE_CANDIDATE!>take<!>(inv::map)
+    <!INAPPLICABLE_CANDIDATE!>take<!>(<!UNRESOLVED_REFERENCE!>inv::map<!>)
 }
 
-fun take(f: ((String) -> String) -> Inv<String>) {}
+fun take(f: ((String) -> String) -> Inv<String>) {}