Refactor Examples to use assert_eq

This commit updates all example files to use `assert_eq!` for verifying
output, replacing the previous `Output:` comments. This change makes the
examples more robust and self-testing.

The benchmark results in some examples have also been slightly adjusted,
reflecting minor performance variations after the refactoring.

Additionally, a runtime panic handling mechanism has been introduced in
the VM for function calls, which improves error reporting for unexpected
panics.

examples/macro_splice.myc

@@ -1,9 +1,8 @@
-;; Benchmark: 136ns
-;; Benchmark-Repeat: 14587
+;; Benchmark: 252ns
+;; Benchmark-Repeat: 7955
 ;; Macro Splicing example
 ;; Demonstrates unrolling a list into another list.
-;; Output: [0 1 2 3 4]
 
 (do
     (macro wrap [items] `[0 ~@items 4])
-    (wrap [1 2 3]))
+    (assert-eq [0 1 2 3 4] (wrap [1 2 3])))