Add Noto Sans Thaana font

[mapmeld]

Thaana (ތާނަ) is the writing system of the Dhivehi language in the Maldives.

It's used in the name tag of multiple places in the Maldives on OpenStreetMap: https://www.openstreetmap.org/#map=13/4.19526/73.53493

The alphabet has 50 codepoints so it won't increase the Noto Sans file size by much: https://en.wikipedia.org/wiki/Thaana_(Unicode_block) Thaana can be readily added to MapLibre projects with the rtl-text plugin ( demo: https://mapmeld.com/maplibre-and-dhivehi-thaana/sample.html )