ThirdwebTransaction.Sign + Modify Estimation/Simulation Flows

[0xFirekeeper]

PR-Codex overview

This PR enhances transaction handling in the SmartWallet and ThirdwebTransaction classes. It includes new methods for estimating gas costs, simulating transactions, and signing operations.

Detailed summary

• Added EstimateUserOperationGas and SignTransaction methods in SmartWallet.cs.
• Added transaction simulation and signing methods in ThirdwebTransaction.cs.
• Expanded transaction handling in test classes.

The following files were skipped due to too many changes: Thirdweb/Thirdweb.Transactions/ThirdwebTransaction.cs

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.79%. Comparing base (dfd8bf3) to head (d400d8d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
+ Coverage   95.33%   95.79%   +0.45%     
==========================================
  Files          15       15              
  Lines        1094     1093       -1     
  Branches      104      103       -1     
==========================================
+ Hits         1043     1047       +4     
+ Misses         34       29       -5     
  Partials       17       17              

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