fix: Invariant crash when swap trade breakdown

[memoyil]

To reproduce:

https://pancakeswap.finance/swap?outputCurrency=0x0b33542240d6fA323c796749F6D6869fdB7F13cA

and input bnb to very large amount: 10000000000000000000000000000000000000000000000000000000000

---

PR-Codex overview

This PR focuses on enhancing error handling in the exchange.ts file by wrapping the route processing logic in a try-catch block, allowing for graceful failure and returning a structured response in case of errors.

Detailed summary

• Added a try-catch block around the route processing logic.
• In the catch block, returns an object with priceImpactWithoutFee set to undefined and lpFeeAmount set to null.
• Maintained the existing logic for calculating routeFeePercent and updating outputAmountWithoutPriceImpact.

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