Add import work schedule button to work schedule ui

Location - https://files.catbox.moe/sxfxv4.png
To mirror the similar UI we have in 4d, this way feature will much easier to find than checking File->Import

src/bonsai/bonsai/bim/module/sequence/ui.py

@@ -174,6 +174,7 @@ class BIM_PT_work_schedules(Panel):
             else:
                 row.label(text="No Work Schedules found.", icon="TEXT")
             row.operator("bim.add_work_schedule", text="", icon="ADD")
+            row.operator("bim.import_work_schedule_csv", text="", icon="IMPORT")
 
         for work_schedule_id, work_schedule in SequenceData.data["work_schedules"].items():
             self.draw_work_schedule_ui(work_schedule_id, work_schedule)