AK+Everywhere: Turn bool keep_empty to an enum in split* functions

Author: https://github.com/demostanis
Commit: 3e8b5ac920
Pull-request: https://github.com/SerenityOS/serenity/pull/15750
Reviewed-by: https://github.com/AtkinsSJ
Reviewed-by: https://github.com/davidot
Reviewed-by: https://github.com/linusg ✅

Meta/Lagom/Tools/CodeGenerators/LibEDID/GeneratePnpIDs.cpp

@@ -91,7 +91,7 @@ static ErrorOr<String> decode_html_entities(StringView const& str)
 
 static ErrorOr<ApprovalDate> parse_approval_date(StringView const& str)
 {
-    auto parts = str.trim_whitespace().split_view('/', true);
+    auto parts = str.trim_whitespace().split_view('/', SplitBehavior::KeepEmpty);
     if (parts.size() != 3)
         return Error::from_string_literal("Failed to parse approval date parts (mm/dd/yyyy)");