Feat/tokenization

[ummarig]

Completed

• Added tokenization_tests.rs

  • Covers:
    • tokenize_asset() success and duplicate tokenization failure
    • mint_tokens() success and max-supply overflow failure
    • burn_tokens() success and insufficient-balance failure
    • transfer_tokens() success, insufficient-balance failure, and self-transfer prevention
    • get_token_balance() after mint and transfer flows

• Registered the new module in mod.rs via:

  • #[path = "../../../opsce/src/tokenization_tests.rs"] mod tokenization_tests;

• Enhanced tokenization.rs

  • Added self-transfer rejection
  • Added max-supply overflow guard in mint_tokens

• Added new errors in error.rs

  • MaxSupplyExceeded
  • InvalidTokenTransfer

Validation

• Editor diagnostics show no errors in:
  • error.rs
  • tokenization.rs
  • mod.rs
  • tokenization_tests.rs

Made changes.

Closes #821
Closes #814

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[yusuftomilola]

thanks for your contribution