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Added solution for Project Euler problem 109 (#4080)

* Added solution for Project Euler problem 109

* New subscriptable builtin types

* updating DIRECTORY.md

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
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fpringle committed
ecf9b8164fc3046ad5e6bbabb4abf3ac6a8a3cbb
Parent: a796ccf
Committed by GitHub <noreply@github.com> on 3/6/2021, 1:29:52 PM