[CONTRACT] Implement Error Handling Module

[truthixify]

Description:
Centralize error handling in errors.rs with a custom Error enum for ManageHub contracts.

Tasks:

• Create src/errors.rs with Error enum including:
  • SubscriptionAlreadyExists
  • InvalidPayment
  • UserNotFound
  • Unauthorized
  • LogAlreadyExists
  • TokenAlreadyIssued
• Use #[contracttype] for the enum.
• Document each error.
• Export for other modules.
• Include in lib.rs.
• Test with a dummy function.

Acceptance Criteria:

• errors.rs defines Error enum with #[contracttype].
• Errors are documented and exported.
• Module compiles.
• Test verifies error return.

[Dospalko]

Hey, i would like to take on this issue ! :)

[truthixify]

It’s yours @Dospalko

[Dospalko]

Will work on this tomorrow if thats ok, have uni today :))

[yusuftomilola]

@Dospalko What is the update on this issue? It's getting too long.

[Dospalko]

PR done, sorry had uni :/

[akronim26]

I noticed that PR #300 is regarding this issue but it is failing checks, also the PR hasn't been updated for a few weeks. If the original assignee of the issue is unavailable, I would like to work on this issue. Would it be okay?

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