Add change note

Author: owen-mc

go/ql/lib/change-notes/2024-05-08-builtin-functions-no-package.md

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+---
+category: minorAnalysis
+---
+* Fixed a bug that stopped built-in functions from being referenced using the predicate `hasQualifiedName` because technically they do not belong to any package. Now you can use the empty string as the package, e.g. `f.hasQualifiedName("", "len")`.
+* Fixed a bug that stopped data flow models for built-in functions from having any effect because the package "" was not parsed correctly.