Define core data types for Groups and Members

[Akshola00]

Description

Define core Rust structs and data types for representing payroll groups and members in the contract state.

Implement data types in src/base/types.rs.

Relevant files:

• contract/src/base/types.rs

Acceptance Criteria

• Create Group struct with: id, creator, token, created_at, member_count
• Create Member struct with: address, percentage, joined_at
• Create GroupMember struct combining Group and Member data
• All structs implement Serialize/Deserialize traits (Soroban compatible)
• Structs include proper type annotations and documentation comments
• Types are exported for use in contract functions
• Relevant contract tests are written
• All contract tests pass
• Contract code builds successfully
• Contract code is properly formatted

Dependencies

None

Additional Notes

• Use Soroban SDK types where applicable (Symbol, Address, u128, etc.)
• Add doc comments explaining each field

[Ugasutun]

Hi, I'd like to work on this issue. I can define the core Soroban-compatible "Group", "Member", and "GroupMember" structs with the required fields, serialization support, documentation, and exports. I'll also add relevant tests and verify the contract builds, tests pass, and formatting is clean.

[Muhammadcodes112]

I’ve gone through this issue and the related codebase sections. I believe I can tackle this, but I do have one quick clarifying question regarding [specific technical detail] before I start. Assuming that works as I think it does, I’m confident I can handle this. Please assign it to me.

[grantfox-oss]

🦊 GrantFox — @Ugasutun has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #55)
2. Your PR will be reviewed by the Web3Novalabs maintainers

Good luck! Track your progress on GrantFox.