[FIR-TEST] Move analysis tests to separate module

compiler/fir/analysis-tests/testData/resolve/fib.kt

@@ -0,0 +1,11 @@
+fun fibIterative(n: Int): Int {
+    if (n < 2) return 1
+    var current = 1
+    var prev = 1
+    for (i in 2..n) {
+        val temp = current
+        current += prev
+        prev = temp
+    }
+    return current
+}