Add Gravity Alpha Mainnet

[ezynda3]

Adds missing chain "Gravity"

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PR-Codex overview

This PR adds support for the Gravity Alpha Mainnet chain.

Detailed summary

• Added Gravity Alpha Mainnet chain to chains/index.ts
• Defined Gravity Alpha Mainnet chain with details in chains/definitions/gravity.ts

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[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 717918f25e6ebaff6898b8d19bf8f62f2e96ea1d

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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