(feat) add Synth API plugin

[Thykof]

Background

The Synth API plugin enable AI agent to fetch the best miner prediction of price of BTC in the next 24 hours by steps of 5 minutes.

More information about Synth Subnet

What does this PR do?

This PR introduces a new plugin for the GOAT SDK, which includes the following features:

• fetch the price of BTC predicted by the current best miner of the Synth Subnet

The PR also add a new example to showcase how the agent can fetch coingecko API for current or past prices and Synth API for future prices predictions. The README.md of the example contains prompt results.

Testing

Detailed testing results

Method	Prompt	Screenshot	Transaction Link
Action #1	Prompt to get it to take that action	Screenshot of the result	Transaction link
Action #2	Prompt to get it to take that action	Screenshot of the result	Transaction link

Docs

For plugins

Note: this plugin doesn't interact with any wallet, it only fetches an API, similarly to CoinGecko plugin.

• I have tested this change locally with key pair wallets
• I have tested this change locally with hosted wallets (e.g. Crossmint Smart Wallets, etc.)
• Package exists in the goat workspace file

Discord username

nathan_thykof

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