[AA] resolve array access expression to corresponding set operator

k1 would suggest `get` as well
 but with current fir structure with fake desugaring
 get is moved to the separate fake psi which doesn't exist
 thus the problem is ignored for now
 ^ KTIJ-24025

analysis/low-level-api-fir/testdata/getOrBuildFir/calls/setOperator.kt

@@ -0,0 +1,12 @@
+package test
+
+class B(val n: Int) {
+    operator fun set(i: Int, a: B) {}
+    operator fun get(i: Int) : B {}
+    operator fun inc() : B {}
+}
+
+fun test() {
+    var a = B(1)
+    <expr>a[2]</expr>++
+}

analysis/low-level-api-fir/testdata/getOrBuildFir/calls/setOperator.txt

@@ -0,0 +1,6 @@
+KT element: KtArrayAccessExpression
+FIR element: FirResolvedNamedReferenceImpl
+FIR source kind: KtRealSourceElementKind
+
+FIR element rendered:
+R|test/B.set|