[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/incompleteCode/diagnosticWithSyntaxError/completeFunctionArgumentsOfNestedCalls.fir.kt

@@ -1,8 +0,0 @@
-package c
-
-fun demo() {
-    val bar = 51
-    fun map(f : <!SYNTAX!><!SYNTAX!><!>fun<!>
-    val foo = 3;
-    bar <!INAPPLICABLE_CANDIDATE!>+<!> map { foo }
-}

compiler/testData/diagnostics/tests/incompleteCode/diagnosticWithSyntaxError/completeFunctionArgumentsOfNestedCalls.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 package c
 
 fun demo() {