Fix GH-12558 Escape \N in generated stubs (#12562)

Escape \U and \u in generated stubs

This fixes an issue where a namespaced class beginning with "U" or "u"
would yield an invalid arginfo file due to the occurrence of a unicode
esca

Escape \U and \u in generated stubs

This fixes an issue where a namespaced class beginning with "U" or "u"
would yield an invalid arginfo file due to the occurrence of a unicode
escape sequence, causing a compile error.

Co-authored-by: Guilliam Xavier <guilliamxavier@users.noreply.github.com>

Closes GH-9154.

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Fix nested namespaced typed property in gen_stub.php (#7418)

Property escape namespaced class name in property types.