feat: add parsing support for INTERFACE-ID, METHOD-ID, class body and INVOKE statement

cobc/cobc.h

@@ -177,6 +177,10 @@ enum cb_current_date {
 #define	CB_CS_REPOSITORY		(COB_U64_C(1) << 42)
 #define	CB_CS_CALL_USING		(COB_U64_C(1) << 43)	/* within USING phrase of CALL statement */
 #define	CB_CS_READY_OR_RESET		(COB_U64_C(1) << 44)
+#define	CB_CS_CLASS_SPECIFIER		(COB_U64_C(1) << 45)
+#define	CB_CS_INTERFACE_SPECIFIER	(COB_U64_C(1) << 46)
+#define	CB_CS_FACTORY_PARAGRAPH		(COB_U64_C(1) << 47)
+#define	CB_CS_OBJECT_PARAGRAPH		(COB_U64_C(1) << 48)
 
 /* Support for cobc from stdin */
 #define COB_DASH			"-"