refactoring: contract related improvements

[marc0olo]

closes #202, #203 & #207

[codecov-commenter]

Codecov Report

Merging #206 (a0838c8) into 3.x (496070f) will decrease coverage by 0.07%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##                3.x     #206      +/-   ##
============================================
- Coverage     12.57%   12.50%   -0.08%     
  Complexity      150      150              
============================================
  Files           150      150              
  Lines          3371     3375       +4     
  Branches         88       84       -4     
============================================
- Hits            424      422       -2     
- Misses         2921     2927       +6     
  Partials         26       26              

Impacted Files	Coverage Δ
...okrauts/aeternity/sdk/constants/BaseConstants.java	0.00% <0.00%> (ø)
.../kryptokrauts/aeternity/sdk/constants/Network.java	70.00% <ø> (-5.00%)	⬇️
...auts/aeternity/sdk/domain/ObjectResultWrapper.java	0.00% <ø> (ø)
...rvice/aeternity/AeternityServiceConfiguration.java	0.00% <0.00%> (ø)
...y/sdk/service/aeternity/impl/AeternityService.java	0.00% <0.00%> (ø)
...rvice/compiler/impl/SophiaCompilerServiceImpl.java	0.00% <0.00%> (ø)
.../sdk/service/transaction/domain/DryRunRequest.java	0.00% <0.00%> (ø)
...rvice/transaction/impl/TransactionServiceImpl.java	0.00% <0.00%> (ø)
.../service/transaction/type/AbstractTransaction.java	0.00% <ø> (ø)
...transaction/type/impl/ContractCallTransaction.java	0.00% <0.00%> (ø)
... and 7 more

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[marc0olo]

@mitch-lbw can we merge this now? :-)

[mitch-lbw]

Changes ready to be merged