Wrap search type enablement status in a search settings class

- Cleaner, more idiomatic usage of a global variable
- Simplifies mocking when testing client in pytest as setting wrapped
  in object rather than a simple type. So passed around by reference

src/utils/config.py

@@ -1,4 +1,6 @@
+# System Packages
 from enum import Enum
+from dataclasses import dataclass
 
 
 class SearchType(str, Enum):
@@ -7,3 +9,12 @@ class SearchType(str, Enum):
     Music = "music"
     Image = "image"
 
+
+@dataclass
+class SearchSettings():
+    notes_search_enabled: bool = False
+    ledger_search_enabled: bool = False
+    music_search_enabled: bool = False
+    image_search_enabled: bool = False
+
+