feat:#71 Implement Escrow::resolve_dispute logic

[OlufunbiIK]

Implemented Escrow::resolve_dispute logic to support secure and trustless dispute resolution within the Lance protocol. This update adds validated state-transition handling, clear Soroban error responses, and optimized on-chain execution aligned with current Soroban SDK standards. Includes test coverage updates, logging for dispute outcomes, and improved readiness for Stellar testnet beta deployment.

Added SAC (Stellar Asset Contract) support to the Escrow contract, enabling secure token-based payments and settlements across the Lance marketplace. This update improves compatibility with the Soroban ecosystem, adds validated asset handling with clear error states, and optimizes contract interactions for lower on-chain cost and faster execution. Includes tests and integration readiness for Stellar testnet beta.

Implemented Escrow::get_job view function to enable efficient retrieval of job and escrow state data for clients, freelancers, and backend services. This update adds validated read-only access to stored contract data, improves marketplace transparency, and ensures compatibility with the current Soroban SDK. Includes test coverage and integration readiness for Stellar testnet beta.

Implemented Escrow::refund logic to enable secure and controlled refund execution within the Lance protocol. This update ensures trustless reversal of escrowed funds under valid conditions, strengthens marketplace reliability, and maintains strict validation and error handling in line with Soroban best practices. Includes test coverage and integration readiness for Stellar testnet deployment.

Closes #71
Closes #72
Closes #73
Closes #74

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