feat: Implement Event Creation Mechanism

[AbilityTechy]

This PR implements the core event creation mechanism for the Predictify hybrid smart contract, enabling administrators to create, validate, and store prediction events. This feature creates a foundation for event management distinct from the full market lifecycle.

Changes

• New Types: Added Event struct and EventStatus enum to manage event state.
• Storage: Implemented EventStorage for secure persistence and unique ID generation.
• Validation: Added EventValidator to enforce business rules (future end times, minimum outcomes, valid descriptions).
• Event Emission: Introduced EventCreatedEvent to notify off-chain indexers of new events.
• Core Logic: Implemented create_event and get_event functions in the main contract.
• Testing: Added comprehensive unit and integration tests covering happy paths, authorization, and edge cases.

Checklist

• Code compiles and passes local tests
• New types and storage patterns follow existing conventions
• Input validation added for all user-supplied data
• Events are emitted for tracking

Related Issues

Closes #196

[greatest0fallt1me]

@AbilityTechy, please resolve the conflicts.

[greatest0fallt1me]

@AbilityTechy, please fix the pipeline and resolve the conflicts.

[greatest0fallt1me]

@AbilityTechy

[greatest0fallt1me]

@AbilityTechy