FIR checker: introduce NO_(GET|SET)_METHOD

Besides introducing new diagnostics, this commit unifies source usages
for array accesses in PSI & LT.

compiler/testData/diagnostics/tests/checkArguments/arrayAccessSetTooManyArgs.fir.kt

@@ -6,6 +6,6 @@ class A {
     operator fun set(x: String, value: Int) {}
 
     fun d(x: Int) {
-        <!INAPPLICABLE_CANDIDATE!>this["", 1] = 1<!>
+        <!INAPPLICABLE_CANDIDATE!>this["", 1]<!> = 1
     }
 }