[SIS-xxx] adding html wrapper for debra images

restructuring and splitting image generation into multiple files
adding doge sun image generation

python/modules/rest-api/utils.py

@@ -0,0 +1,17 @@
+from io import BytesIO
+
+from flask import send_file
+
+
+def serve_pil_image(pil_img):
+    img_io = BytesIO()
+    pil_img.save(img_io, 'PNG')
+    img_io.seek(0)
+    return send_file(img_io, mimetype='image/png')
+
+
+class ValidationException(Exception):
+    def __init__(self, provided_value, message):
+        self.provided_value = provided_value
+        self.message = message
+        super().__init__(f'{self.message}: provided value: {provided_value}')