Chain Fetch Util

[0xFirekeeper]

PR-Codex overview

This PR introduces a new method FetchThirdwebChainDataAsync to fetch chain data asynchronously. It also adds related classes for JSON deserialization and updates tests accordingly.

Detailed summary

• Added FetchThirdwebChainDataAsync method to fetch chain data asynchronously
• Introduced classes for JSON deserialization
• Updated tests for the new method

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 87.50000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 90.28%. Comparing base (dae01ad) to head (7f1b27c).

Files	Patch %	Lines
Thirdweb/Thirdweb.Utils/Utils.cs	63.15%	6 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   90.37%   90.28%   -0.09%     
==========================================
  Files          24       25       +1     
  Lines        2919     2975      +56     
  Branches      383      384       +1     
==========================================
+ Hits         2638     2686      +48     
- Misses        206      212       +6     
- Partials       75       77       +2     

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