term: add an ‘id’ member to the the ‘row_uri_range’ struct

term_osc8_close() sets it from the OSC-8 ID tracked in the VT
sub-struct.

terminal.c

@@ -3059,6 +3059,7 @@ term_osc8_close(struct terminal *term)
         struct row_uri_range range = {
             .start = start_col,
             .end = end_col,
+            .id = term->vt.osc8.id,
             .uri = xstrdup(term->vt.osc8.uri),
         };
         tll_push_back(row->extra->uri_ranges, range);

terminal.h

@@ -89,6 +89,7 @@ struct composed {
 struct row_uri_range {
     int start;
     int end;
+    uint64_t id;
     char *uri;
 };