Rework module parsing and execution (#4462)

This patch disables automatic detection of module code, and instead
requires the user to explicitly specify whether to parse a source
as a module or as a script.

To achieve this the jerry_parse API function now takes a new option
which signals that the source should be parsed as a module.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai daniel.batyai@h-lab.eu

jerry-main/main-options.h

@@ -38,6 +38,7 @@ typedef enum
 typedef enum
 {
   SOURCE_SNAPSHOT,
+  SOURCE_MODULE,
   SOURCE_SCRIPT,
 } main_source_type_t;