Resolve "Create the Geometry, Quadkey, RelationID and Floorspace rules"

Closes #4 (closed)

Additionally remving pylint from the linters to avoid error messages regarding missing libraries as this repository is not a regular package.

\approve @tara @ds

building/02_process/stories_and_floorspace/stories_and_floorspace.py

+class StoriesAndFloorspaceRule:
+    def __call__(self, tags, relations, area, *args, **kwargs):
+        """
+        Find the `building:levels` tag in the attributes of the building or one of the building
+        relations and save this as the number of stories. Calculate the floorspace of the
+        building, based on the footprint size of the building and the number of stories.
+
+        Args:
+            tags (dict):
+                Building tags, such as the building levels or building type.
+            relations (list):
+                List of the attributes of all relations that the building is member of.
+            area (float):
+                Footprint size of the building.
+
+        Returns:
+            A dictionary with the number of stories and the floorspace of the building.
+        """
+
+        from math import ceil
+
+        story_options = [
+            self.get_story_tag(building["tags"]) for building in [tags] + relations
+        ]
+
+        for story_string in story_options:
+            if story_string is None or story_string == "":
+                continue
+            try:
+                stories = ceil(float(story_string))
+                if stories < 1:
+                    raise ValueError("Number of stories cannot be below 1")
+                floorspace = stories * area
+                return {"stories": stories, "floorspace": floorspace}
+            except ValueError:
+                continue
+        return {"stories": None, "floorspace": None}
+
+    @staticmethod
+    def get_story_tag(tags):
+        """
+        Get the number of stories, if the attribute `building:levels` exist
+
+        Args:
+            tags:
+                Building tags, such as the building levels or building type.
+
+        Returns:
+            Number of stories, if the attribute `building:levels` exist, otherwise `None`.
+        """
+
+        return tags.get("building:levels", None)