Adding sign and transact function in pypechain contract functions

[slundqui]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 21.46947% with 823 lines in your changes missing coverage. Please review.

Project coverage is 59.32%. Comparing base (2eb3bb7) to head (ef8b82a).

Files with missing lines	Patch %	Lines
...ain/test/return_types/types/ReturnTypesContract.py	10.00%	216 Missing ⚠️
...est/overloading/types/OverloadedMethodsContract.py	10.00%	144 Missing ⚠️
...loyment/types/ConstructorWithStructArgsContract.py	10.00%	54 Missing ⚠️
pypechain/test/events/types/EventsContract.py	10.00%	54 Missing ⚠️
pypechain/test/structs/types/StructsAContract.py	10.00%	54 Missing ⚠️
pypechain/test/errors/types/ErrorsContract.py	30.00%	42 Missing ⚠️
...test/deployment/types/ConstructorNoArgsContract.py	10.00%	36 Missing ⚠️
...st/deployment/types/ConstructorWithArgsContract.py	10.00%	36 Missing ⚠️
...ain/test/deployment/types/NoConstructorContract.py	10.00%	36 Missing ⚠️
pypechain/test/structs/types/StructsBContract.py	10.00%	36 Missing ⚠️
... and 5 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #139       +/-   ##
===========================================
- Coverage   70.06%   59.32%   -10.75%     
===========================================
  Files          59       62        +3     
  Lines        3638     4681     +1043     
===========================================
+ Hits         2549     2777      +228     
- Misses       1089     1904      +815     

Flag	Coverage Δ
unittests	59.32% <21.46%> (-10.75%)	⬇️

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