feat: new methods that return SendTransaction

[r4mmer]

Acceptance Criteria

• Create new methods that build transactions but return the SendTransaction instance instead of automatically mining the transactions.

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.52%. Comparing base (081fb51) to head (8641a62).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #785      +/-   ##
==========================================
+ Coverage   80.50%   80.52%   +0.02%     
==========================================
  Files          81       81              
  Lines        6442     6460      +18     
  Branches     1391     1400       +9     
==========================================
+ Hits         5186     5202      +16     
- Misses       1243     1245       +2     
  Partials       13       13              

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