topdown: support glob.match without delimiters (#4933)

Using null for delimiters disables delimiters in glob matching. Preferable over regex on some cases for performance reasons.

Fixes #4923.

Signed-off-by: vinhph0906 <vinhph0906@gmail.com>
Co-authored-by: Stephan Renatus <stephan.renatus@gmail.com>