Add OpenGradient plugin

[devin-ai-integration]

Add OpenGradient plugin for on-chain ML and LLM inference. This plugin integrates the GOAT SDK with OpenGradient's on-chain inference capabilities for both general ML models and LLMs.

Link to Devin run: https://app.devin.ai/sessions/416904991ce44ced9653fb4572f7bc8a
Requested by: joyce@paella.dev

[changeset-bot]

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Latest commit: 7dc5e4d

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[devin-ai-integration]

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