[bridge] Refactor StellarWallet processTransaction method #1051
Description
The current implementation is functional but inefficient when a transaction contains multiple "account_credited" effects for the bridge account. It leads to redundant API calls to fetch the same operations multiple times, which slows down the process.
To improve this, the method should be refactored to eliminate these redundant API calls. Additionally, it should validate the asset type and issuer for each payment.
It's also essential to handle cases where there are other operations besides payments, as this could cause some payment operations to be skipped and remain unprocessed.