feat: implement Soroban transaction validation, rebuild, confirmation, and review services

[eyooTech]

Summary

This PR implements transaction reliability, validation, confirmation, and review functionality for Soroban and Stellar bridge transactions.

Changes

• Implemented a Soroban transaction rebuild service for rebuilding stale or recoverable failed transactions using refreshed network data.
• Preserved original user transfer intent during transaction rebuilds while refreshing sequence numbers, resource estimates, and quote data.
• Added protection against rebuilding non-recoverable transaction failures.
• Implemented a Soroban contract allowance validator to validate available token allowance before contract-based transfers.
• Added insufficient allowance detection with required and available allowance values exposed through validation results and errors.
• Implemented a configurable Stellar bridge execution confirmation policy.
• Added support for configurable minimum confirmation thresholds and finalized transaction detection.
• Exposed normalized confirmation state for execution and transaction consumers.
• Implemented a normalized Stellar wallet transaction review model.
• Added transfer source and destination details, transfer amounts, estimated fees, and contract interaction information.
• Added transaction warnings for unusual or incomplete parameters.
• Added tests covering rebuild behavior, non-recoverable failures, allowance validation, confirmation thresholds, finalized states, transaction review normalization, fees, contract interactions, and warnings.

Issues

Closes #991
Closes #993
Closes #994
Closes #995

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