Sushi: swap, quote and find-token actions

[LufyCZ]

What changed? Why?

• Added sushiRouterActionProvider to provide swap and quote functionality using the Sushi Router API.
• Added swap action for swaps.
• Added quote action for fetching quotes for swaps.
• Added sushiDataActionProvider to provide token finding functionality using the Sushi Data API.
• Added find-tokens action for fetching tokens by symbols or addresses.

Why? No on-chain swap solution was present. Also, the agent didn't have a repository to pull token details from.

Features

End-to-End swap on-chain experience. Asking the agent to "Swap 1 ETH to USDC" results in a successful swap. The agent first looks up the address of "USDC" (it already knows that ETH is 0xee...ee in the context of Sushi), then, it fetches a quote and asks the user if they want to continue. If they do, the swap is executed. Cases like insufficient balance or allowance is handled.

Qualified Impact

Nothing should be affected, worst case, the user can remove the sushi actions.

Showcase

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1