refactor: rename Ptr utility to HeapPtr

[rodrigo-pino]

Changed it so that everyone in the future is aware that using Ptr has the inherent cost of a heap allocation

[codecov]

Codecov Report

Attention: Patch coverage is 86.53846% with 7 lines in your changes missing coverage. Please review.

Project coverage is 73.65%. Comparing base (c905aaf) to head (4ed675e).

Files with missing lines	Patch %	Lines
rpc/v6/trace.go	33.33%	2 Missing ⚠️
rpc/v7/trace.go	33.33%	2 Missing ⚠️
rpc/v8/trace.go	33.33%	2 Missing ⚠️
rpc/v7/simulation.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2588      +/-   ##
==========================================
- Coverage   73.68%   73.65%   -0.03%     
==========================================
  Files         137      137              
  Lines       16711    16711              
==========================================
- Hits        12313    12308       -5     
- Misses       3536     3540       +4     
- Partials      862      863       +1     

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