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-core/ecma/base/ecma-globals.h

@@ -1059,6 +1059,14 @@ typedef struct
 #endif /* ENABLED (JERRY_SNAPSHOT_EXEC) */
 
 #if ENABLED (JERRY_ESNEXT)
+/**
+ * Flags for runnable objects.
+ */
+typedef enum
+{
+  ECMA_RUNNABLE_FLAGS_EMPTY = (0), /**< empty flags */
+  ECMA_RUNNABLE_FLAGS_MODULE = (1 << 0) /**< runnable is a module */
+} ecma_runnable_flags_t;
 
 /**
  * Description of arrow function objects.