Feature: Adds chains function

[gregfromstl]

---

PR-Codex overview

This PR adds a new feature to the thirdweb library that allows users to retrieve supported chains for the Universal Bridge. It introduces a new chains function and a corresponding Chain interface, enhancing the functionality related to blockchain support.

Detailed summary

• Added export of chains from ./Chains.js.
• Introduced Chain interface in ./types/Chain.js to represent blockchain details.
• Implemented chains function in ./Chains.ts to fetch supported chains.
• Created tests for the chains function in Chains.test.ts.
• Updated documentation to include usage examples and details about the chains function.

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[linear]

TOOL-4381 Add `/chain` endpoint

[changeset-bot]

🦋 Changeset detected

Latest commit: c61679b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
thirdweb	Minor
@thirdweb-dev/wagmi-adapter	Patch

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[codecov]

Codecov Report

Attention: Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 55.03%. Comparing base (6dd2b09) to head (c61679b).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/thirdweb/src/bridge/Chains.ts	71.42%	4 Missing ⚠️

❌ Your patch status has failed because the patch coverage (73.33%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6956   +/-   ##
=======================================
  Coverage   55.03%   55.03%           
=======================================
  Files         897      898    +1     
  Lines       57327    57342   +15     
  Branches     3964     3966    +2     
=======================================
+ Hits        31551    31561   +10     
- Misses      25680    25684    +4     
- Partials       96       97    +1     

Flag	Coverage Δ
packages	55.03% <73.33%> (+<0.01%)	⬆️

Files with missing lines	Coverage Δ
packages/thirdweb/src/bridge/index.ts	100.00% <100.00%> (ø)
packages/thirdweb/src/bridge/Chains.ts	71.42% <71.42%> (ø)

... and 1 file with indirect coverage changes

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