feat(custom-rulesets): support custom rulesets (#23)

* feat(custom_ruleset): add custom rulesets support

* feat(custom-ruleset): add version check

* feat(custom-ruleset): add LegacyIO API to get ruleset hashes

* feat(pp): add check for rulesets whose pp cannot be calculated

* docs(readme): update README to include support for custom rulesets

* fix(custom-ruleset): make `rulesets` empty instead of throw a error when version check is disabled

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* chore(custom-ruleset): apply the latest changes of generator

c891bcd159

and

e25041ad3b

* feat(calculator): add fallback performance calculation for unsupported modes

* fix(calculator): remove debug print

* fix: resolve reviews

* feat(calculator): add difficulty calculation checks

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

scripts/generate_ruleset_attributes.py

@@ -16,7 +16,7 @@ def generate_model(schema_file: Path, version: str = ""):
         temp_file.unlink()
     temp_file.touch()
 
-    version = version or datetime.datetime.now().strftime("%Y.%m.%d")
+    version = version or f"{datetime.datetime.now().strftime('%Y.%m%d')}.0"
 
     generate(
         input_=schema_file,