Unity Compatibility + Customizability + Various Improvements

[0xFirekeeper]

Refactor to a cross-platform http client wrapper, must test thoroughly with Unity use case. May require additional conditional compilation.

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PR-Codex overview

The focus of this PR is to update encryption iteration count, enhance HTTP client functionality, and improve contract handling.

Detailed summary

• Updated encryption iteration count for enhanced security
• Added new HTTP client functionality for better request handling
• Improved contract handling by passing the client object instead of address and chain ID

The following files were skipped due to too many changes: Thirdweb/Thirdweb.Http/ThirdwebHttpContent.cs, Thirdweb/Thirdweb.Wallets/InAppWallet/EmbeddedWallet/EmbeddedWallet.cs, Thirdweb.Tests/Thirdweb.ZkSmartWallet.Tests.cs, Thirdweb/Thirdweb.Client/ThirdwebClient.cs, Thirdweb/Thirdweb.Storage/ThirdwebStorage.cs, Thirdweb/Thirdweb.Wallets/SmartWallet/Thirdweb.AccountAbstraction/BundlerClient.cs, Thirdweb/Thirdweb.RPC/ThirdwebRPC.cs, Thirdweb/Thirdweb.Http/ThirdwebHttpClient.cs, Thirdweb/Thirdweb.Wallets/PrivateKeyWallet/PrivateKeyWallet.cs, Thirdweb.Tests/Thirdweb.PrivateKeyWallet.Tests.cs, Thirdweb/Thirdweb.Wallets/SmartWallet/SmartWallet.cs, Thirdweb.Tests/Thirdweb.Transactions.Tests.cs, Thirdweb/Thirdweb.Transactions/ThirdwebTransaction.cs, Thirdweb.Tests/Thirdweb.Http.Tests.cs, Thirdweb/Thirdweb.Wallets/InAppWallet/EmbeddedWallet.Authentication/Server.cs

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.94009% with 24 lines in your changes missing coverage. Please review.

Project coverage is 92.53%. Comparing base (c94e5cc) to head (b872266).
Report is 4 commits behind head on main.

Files	Patch %	Lines
...rdweb/Thirdweb.Transactions/ThirdwebTransaction.cs	75.67%	4 Missing and 5 partials ⚠️
...irdweb/Thirdweb.Wallets/SmartWallet/SmartWallet.cs	30.76%	1 Missing and 8 partials ⚠️
...rdweb.Wallets/PrivateKeyWallet/PrivateKeyWallet.cs	72.22%	5 Missing ⚠️
...allet/Thirdweb.AccountAbstraction/BundlerClient.cs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   85.98%   92.53%   +6.55%     
==========================================
  Files          18       21       +3     
  Lines        1605     1647      +42     
  Branches      156      150       -6     
==========================================
+ Hits         1380     1524     +144     
+ Misses        184       85      -99     
+ Partials       41       38       -3     

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