feat(pp-calculator): support other pp calculators (#57)

New configurations:

- CALCULATOR="rosu": specific pp calculator
- CALCULATOR_CONFIG='{}': argument passed through into calculator

app/models/beatmap.py

@@ -69,23 +69,6 @@ class Language(IntEnum):
     OTHER = 14
 
 
-class BeatmapAttributes(BaseModel):
-    star_rating: float
-    max_combo: int
-
-    # osu
-    aim_difficulty: float | None = None
-    aim_difficult_slider_count: float | None = None
-    speed_difficulty: float | None = None
-    speed_note_count: float | None = None
-    slider_factor: float | None = None
-    aim_difficult_strain_count: float | None = None
-    speed_difficult_strain_count: float | None = None
-
-    # taiko
-    mono_stamina_factor: float | None = None
-
-
 def _parse_list(v: Any):
     if isinstance(v, str):
         return v.split(".")