Add SwiftLint rule to enforce stack spacing. (#2080)

Xcode 15 changes the default behaviour and given we're always working from designs, we shouldn't rely on it for our layout.

.swiftlint.yml

@@ -49,6 +49,18 @@ nesting:
     warning: 5
 
 custom_rules:
+  vstack_spacing:
+    regex: "(?-s)VStack((?!spacing:).)*\\s*\\{"
+    match_kinds: identifier
+    message: "Please use explicit spacing in VStacks."
+    severity: warning
+
+  hstack_spacing:
+    regex: "(?-s)HStack((?!spacing:).)*\\s*\\{"
+    match_kinds: identifier
+    message: "Please use explicit spacing in HStacks."
+    severity: warning
+
   print_deprecation:
     regex: "\\b(print)\\b"
     match_kinds: identifier