[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/inference/constraints/constraintOnFunctionLiteral.fir.kt

@@ -3,7 +3,7 @@ package c
 
 import java.util.ArrayList
 
-fun Array<Int>.toIntArray(): IntArray = this.<!INAPPLICABLE_CANDIDATE!>mapTo<!>(IntArray(size), {<!UNRESOLVED_REFERENCE!>it<!>})
+fun Array<Int>.toIntArray(): IntArray = this.<!INAPPLICABLE_CANDIDATE!>mapTo<!>(IntArray(size), {it})
 
 fun Array<Int>.toArrayList(): ArrayList<Int> = this.mapTo(ArrayList<Int>(size), {it})