feat: optimize VM using dispatch table

src/vm/handlers/group_not.c

@@ -0,0 +1,18 @@
+#include <vm/fzl_vm.h>
+#include <vm/internals/opcode.h>
+
+int op_not(fzl_vm_t *vm)
+{
+  if (vm->dtop < 1)
+  {
+    snprintf(last_err, sizeof(last_err),
+             "runtime error - expected value in data stack");
+    print_err_data(vm);
+    return -1;
+  }
+
+  fzl_value_t notval = vm->dstack[--vm->dtop];
+  vm->dstack[vm->dtop++] =
+      (fzl_value_t){.type = FZL_TYPE_BOOL, .as.b = !notval.as.b};
+  return 0;
+}