Refactored SealBridge.Encrypt() method and updated Seal TS packages

[viol3]

…onceBytes only, readme updated

Describe your changes

• Refactored SealBridge.Encrypt() method to return EncryptionResult class containing encrypted bytes and nonce instead of a pre-built TransactionBlock. This allows users to construct their own custom transaction blocks based on their specific contract requirements, providing greater flexibility in how encrypted data is stored on-chain.
• Updated seal.bundle.js packages with latest versions of mysten/sui, mysten/seal and mysten/enoki

Issue ticket number and link

Checklist before requesting a review

• I have performed a self-review of my code
• If it is a core feature, I have added thorough tests.
• Do we need to implement analytics?
• Will this be part of a product update? If yes, please write one phrase about this update.
• Product Update: Seal encryption now returns raw encrypted data and nonce, enabling developers to integrate encrypted storage into custom smart contract workflows.