Refactor SignMultichain component and improve type checking

[Pessina]

• Refactor SignMultichain component to handle message events more efficiently
• Improve type checking for Chain and related types
• Simplify signMultichainTransaction function and remove unnecessary useEffects
• Update utility functions to use the improved Chain type
• Clean up and optimize code in various files

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
fast-auth-signer	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 17, 2024 11:01pm