Features/letter symbol type

[opoudjis]

Metanorma PR checklist

• Breaking changes (list related PRs)
• Documentation update required (create task for this)
• External dependency introduced (documentation update need)
• Gem with native library introduced

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7338573) 96.61% compared to head (e91300a) 96.61%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #835   +/-   ##
=======================================
  Coverage   96.61%   96.61%           
=======================================
  Files          64       64           
  Lines        5287     5289    +2     
=======================================
+ Hits         5108     5110    +2     
  Misses        179      179           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.