feat(pdfinterp): add on_new_stream call and method

- call on_new_stream in pdfinterp.py to reset color spaces
- implement on_new_stream in il_creater.py to reset stroking and non-stroking color space names

yadt/document_il/frontend/il_creater.py

@@ -29,6 +29,10 @@ def on_stroking_color_space(self, color_space_name):
     def on_non_stroking_color_space(self, color_space_name):
         self.non_stroking_color_space_name = color_space_name
 
+    def on_new_stream(self):
+        self.stroking_color_space_name = None
+        self.non_stroking_color_space_name = None
+
     def on_page_start(self):
         self.current_page = il_version_1.Page(
             pdf_font=[],

yadt/pdfinterp.py

@@ -348,6 +348,7 @@ def execute(self, streams: Sequence[object]) -> None:
         while True:
             try:
                 (_, obj) = parser.nextobject()
+                self.il_creater.on_new_stream()
             except PSEOF:
                 break
             if isinstance(obj, PSKeyword):