contract tests

[0xFirekeeper]

PR-Codex overview

This PR focuses on enhancing Thirdweb's smart contract interactions by introducing private key accounts, updating contract interactions, and adding test cases for contract initialization and read/write operations.

Detailed summary

• Added PRIVATE_KEY secret to CI workflow
• Updated PrivateKeyAccount to handle private key accounts
• Updated SmartAccount with default entry point address
• Added PRIVATE_KEY environment variable in tests
• Modified contract transactions based on account type
• Added contract interaction tests for different scenarios

The following files were skipped due to too many changes: Thirdweb.Tests/Thirdweb.Contracts.Tests.cs

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 28.33%. Comparing base (591cea1) to head (5d68451).

Files	Patch %	Lines
Thirdweb/Thirdweb.Contracts/ThirdwebContract.cs	70.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #10       +/-   ##
===========================================
+ Coverage   14.12%   28.33%   +14.21%     
===========================================
  Files          33       33               
  Lines        2365     2361        -4     
  Branches      217      216        -1     
===========================================
+ Hits          334      669      +335     
+ Misses       2029     1671      -358     
- Partials        2       21       +19     

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