Type hint Talon cheatsheet get_list (#1850)

## Checklist

- [ ] ~I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)~
- [ ] ~I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)~
- [x] I have not broken the cheatsheet

src/cheatsheet/get_list.py

@@ -1,33 +1,48 @@
 import re
+from collections.abc import Mapping, Sequence
+from typing import Optional, TypedDict
 
 from talon import registry
 
 from ..conventions import get_cursorless_list_name
 
 
-def get_list(name, type, descriptions=None):
+class Variation(TypedDict):
+    spokenForm: str
+    description: str
+
+
+class ListItemDescriptor(TypedDict):
+    id: str
+    type: str
+    variations: list[Variation]
+
+
+def get_list(
+    name: str, type: str, descriptions: Optional[Mapping[str, str]] = None
+) -> list[ListItemDescriptor]:
     if descriptions is None:
         descriptions = {}
 
     items = get_raw_list(name)
-    item_dict = items if isinstance(items, dict) else {item: item for item in items}
 
-    return make_dict_readable(type, item_dict, descriptions)
+    return make_dict_readable(type, items, descriptions)
 
 
-def get_lists(names: list[str], type: str, descriptions=None):
+def get_lists(
+    names: Sequence[str], type: str, descriptions: Optional[Mapping[str, str]] = None
+) -> list[ListItemDescriptor]:
     return [item for name in names for item in get_list(name, type, descriptions)]
 
 
-def get_raw_list(name):
+def get_raw_list(name: str) -> Mapping[str, str]:
     cursorless_list_name = get_cursorless_list_name(name)
     return registry.lists[cursorless_list_name][0].copy()
 
 
-def make_dict_readable(type: str, dict, descriptions=None):
-    if descriptions is None:
-        descriptions = {}
-
+def make_dict_readable(
+    type: str, dict: Mapping[str, str], descriptions: Mapping[str, str]
+) -> list[ListItemDescriptor]:
     return [
         {
             "id": value,
@@ -43,7 +58,7 @@ def make_dict_readable(type: str, dict, descriptions=None):
     ]
 
 
-def make_readable(text):
+def make_readable(text: str) -> str:
     text = text.replace(".", " ")
     return de_camel(text).lower().capitalize()