test: add fibonacci golden test, expand GOLDEN_TESTS

tests/golden/fibonacci/src/Main.bux

@@ -0,0 +1,23 @@
+// Fibonacci - Recursive function with while loop
+import Std::Io::{PrintLine};
+import Std::Fmt::{Fmt_Fmt1};
+
+func Fibonacci(n: int) -> int {
+    if n <= 1 {
+        return n;
+    }
+    return Fibonacci(n - 1) + Fibonacci(n - 2);
+}
+
+func Main() -> int {
+    PrintLine("Fibonacci sequence:");
+    
+    var i: int = 0;
+    while i < 10 {
+        let fib: int = Fibonacci(i);
+        PrintLine(Fmt_Fmt1("{0}", String_FromInt(fib)));
+        i = i + 1;
+    }
+    
+    return 0;
+}