Chain metadata fetching util int -> BigInteger

[0xFirekeeper]

Closes TOOL-3489

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PR-Codex overview

This PR updates the ThirdwebChainData class in the Thirdweb.Utils namespace to use BigInteger for ChainId and NetworkId properties instead of int, allowing for larger numerical values.

Detailed summary

• Changed the type of ChainId from int to BigInteger.
• Changed the type of NetworkId from int to BigInteger.

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[linear]

TOOL-3489 Update chain metadata util to BigInteger

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.69%. Comparing base (0ba0ee9) to head (46dc2f5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #132   +/-   ##
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  Coverage   72.69%   72.69%           
=======================================
  Files          34       34           
  Lines        5233     5233           
  Branches      693      693           
=======================================
  Hits         3804     3804           
  Misses       1254     1254           
  Partials      175      175           

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