Refactor: Reuse v6 starknet_add-Invoke/DeployAccount/Declare-Transaction handler for v7

[hudem1]

rpc pkg cleanup to #2437

• Fix a little missing validation field for the SenderAddress field inside v6 Transaction type.

• Reuse v6 handler for v7 for starknet_addInvokeTransaction, starknet_addDeployAccountTransaction and starknet_addDeclareTransaction

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.60%. Comparing base (1709a05) to head (1a7ac25).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2534      +/-   ##
==========================================
+ Coverage   73.52%   73.60%   +0.08%     
==========================================
  Files         136      136              
  Lines       16659    16529     -130     
==========================================
- Hits        12248    12166      -82     
+ Misses       3545     3501      -44     
+ Partials      866      862       -4     

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