fix(arns): change arns to throw errors and wrap calls with pcall

[dtfiedler]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 40.90909% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 50.53%. Comparing base (0115ce2) to head (58dd0b3).

Files	Patch %	Lines
contract/src/arns.lua	40.90%	13 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop      #16       +/-   ##
============================================
+ Coverage         0   50.53%   +50.53%     
============================================
  Files            0        9        +9     
  Lines            0     1207     +1207     
============================================
+ Hits             0      610      +610     
- Misses           0      597      +597     

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