feat(arns): add demand factor to arns name purchases and name extensions

[dtfiedler]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 60.71429% with 66 lines in your changes are missing coverage. Please review.

Project coverage is 61.64%. Comparing base (89f68ab) to head (9981298).

Files	Patch %	Lines
contract/src/gar.lua	26.76%	52 Missing ⚠️
contract/src/arns.lua	84.21%	12 Missing ⚠️
contract/src/utils.lua	88.88%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #20      +/-   ##
===========================================
+ Coverage    59.94%   61.64%   +1.70%     
===========================================
  Files            7        7              
  Lines         1001     1022      +21     
===========================================
+ Hits           600      630      +30     
+ Misses         401      392       -9     

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