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>

static/custom_ruleset_version_hash.json

@@ -0,0 +1,32 @@
+{
+  "Sentakki": {
+    "latest-version": "2025.1012.1",
+    "versions": {
+      "2025.1012.1": "66e02af2097f446246b146641295573a"
+    }
+  },
+  "tau": {
+    "latest-version": "2025.1012.1",
+    "versions": {
+      "2025.1012.1": "3a2dd168c2e520a3620a5dfd7b3c0b73"
+    }
+  },
+  "rush": {
+    "latest-version": "2025.1012.1",
+    "versions": {
+      "2025.1012.1": "df0c211c8c40f42feb119a3a11549a6f"
+    }
+  },
+  "hishigata": {
+    "latest-version": "2025.1012.1",
+    "versions": {
+      "2025.1012.1": "af26c2946cd0b2258ac52f5cce91958c"
+    }
+  },
+  "soyokaze": {
+    "latest-version": "2025.1012.1",
+    "versions": {
+      "2025.1012.1": "fea5c97b8b436305ba98ef8b39b133b6"
+    }
+  }
+}