[WIP] Fix encryption and decryption methods in sdk.ts

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

work folder: ./service/src
File sdk.ts
Medthod: setChannel
Fix: Encrypt aesPlain before sending it via sharePublicKey, use cryptoUtils.encryptMessage

Method: getPublicKey
Fix: Decrypt receiverPublicKey.aesKey then set it await this.symEncryption.setRemoteAesKey, use cryptoUtils.decryptMessage

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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