add testnet and mainnet configs for access from the package

[Shreyas-sei]

This PR adds chain configs under chain.ts which were missing and docs were importing them in the examples.

Relates to PLT-96

[changeset-bot]

⚠️ No Changeset found

Latest commit: 441daea

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.72%. Comparing base (34a09d8) to head (441daea).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #300      +/-   ##
==========================================
+ Coverage   79.69%   79.72%   +0.03%     
==========================================
  Files          83       83              
  Lines        1305     1307       +2     
  Branches      187      215      +28     
==========================================
+ Hits         1040     1042       +2     
- Misses        259      265       +6     
+ Partials        6        0       -6     

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