[Soroban] Implement transfer with royalty enforcement

[Eniola3321]

Description:
When an NFT is transferred, automatically enforce royalty payment to the creator.
Acceptance Criteria:

Override transfer function to calculate and handle royalty
Emit RoyaltyPaid event
Support native XLM and custom asset payments

[mikevill20]

@mikevill20 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hello Maintainer, please assign this issue to me. Thanks

ℹ️ Repo Maintainers: To accept this application, review their application or assign @mikevill20 to this issue.