[SDK] Feature: Export monadTestnet from thirdweb/chains

[nkrishang]

PR-Codex overview

This PR adds a new blockchain definition for monadTestnet to the project, allowing it to be exported and utilized within the application.

Detailed summary

• Added export for monadTestnet in packages/thirdweb/src/exports/chains.ts.
• Created monadTestnet in packages/thirdweb/src/chains/chain-definitions/monad-testnet.ts.
  • Defined with id, name, nativeCurrency, and blockExplorers.
  • Marked as a testnet.

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Latest commit: 69db9a8

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[joaquim-verges]

Ty!