config: added botanix testnet chain

[thobbyAk]

The focus of this PR is to add support for the Botanix Testnet chain.

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PR-Codex overview

The focus of this PR is to add support for the Botanix Testnet in the project.

Detailed summary

• Added Botanix Testnet to the chains
• Created botanixTestnet definition in src/chains/definitions
• Defined chain properties for Botanix Testnet such as ID, name, native currency, RPC URLs, block explorers, and testnet status

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[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 1f414fe646889f823650784883caa015115dbc7d

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

This PR includes changesets to release 1 package

| Name | Type | | ---- | ----- | | viem | Patch |

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[vercel[bot]]

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