FIR IDE: move analysis api fir testdata to the analysis directory

analysis/analysis-api/testData/components/importOptimizer/usedFunctionImport.kt

@@ -0,0 +1,13 @@
+// FILE: main.kt
+package test
+
+import dependency.foo
+
+fun usage() {
+    foo()
+}
+
+// FILE: dependency.kt
+package dependency
+
+fun foo() {}