FIR IDE: move low level api testdata sources to the analysis directory

analysis/low-level-api-fir/testdata/innerDeclarationsResolve/class.kt

@@ -0,0 +1,8 @@
+class B {
+    fun q(): C {}
+    private val y = q()
+
+    fun foo(a: A) = with(a) {
+        bar("a", y)
+    }
+}