Add arrow character codes on the verticalizedCharacterMap

[kkokkojeong]

Launch Checklist

I know that CJK fonts are complex to render. During testing, I found that the arrow special character and CJK font representation were ugly.
This PR describes that is to add arrow special character to the verticalizedCharacterMap object.

I had test named Display line that crosses 180th meridian

(Ps. I'm awesome about the great mapbox library 👍 )

before	after

• briefly describe the changes in this PR
• include before/after visuals or gifs if this PR includes visual changes
• write tests for all new functionality
• document any changes to public APIs
• post benchmark scores
• manually test the debug page
• tagged @mapbox/map-design-team @mapbox/static-apis if this PR includes style spec API or visual changes
• tagged @mapbox/gl-native if this PR includes shader changes or needs a native port
• apply changelog label ('bug', 'feature', 'docs', etc) or use the label 'skip changelog'
• add an entry inside this element for inclusion in the mapbox-gl-js changelog: <changelog>Add arrow characters to the map of verticalized character</changelog>

[CLAassistant]

All committers have signed the CLA.

[stepankuzmin]

Looks good to me, thanks @kkokkojeong 👍