Implement get_groups_by_creator function

[Akshola00]

Description

Implement the get_groups_by_creator function to retrieve all groups created by a specific address.

Add implementation in src/lib.rs.

Relevant files:

• contract/src/lib.rs

Acceptance Criteria

• Function accepts: creator (Address)
• Function queries contract state for all groups by creator
• Function returns Vec of Groups
• Function returns empty vector if creator has no groups
• Handles invalid creator address gracefully
• Results are in consistent order (e.g., by creation time)
• Relevant contract tests are written
• All contract tests pass
• Contract code builds successfully
• Contract code is properly formatted

Dependencies

C-1 (Error types), C-2 (Data types), C-5 (Group creation)

Additional Notes

• May require a secondary index for efficient querying
• Consider pagination for large result sets (future enhancement)

[MicD746]

Hello Maintainer, please can I work on this issue and give you a better result

[grantfox-oss]

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Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #60)
2. Your PR will be reviewed by the Web3Novalabs maintainers

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