feat: add NFT minting and distribution logic for rewards (#330)

[karanjadavi]

• Add NftCollection, Nft, NftStatus structs and DataKey variants in types.rs
• Add NftError variant to ContractError in errors.rs
• Implement nft.rs component: create_nft_collection, mint_nft, batch_mint_nfts, transfer_nft, burn_nft, claim_nft_reward, deactivate_nft_collection, getters
• Add NFT event publish functions in events.rs using env.events().publish()
• Expose all NFT functions via ShadeTrait interface and shade.rs impl
• Add pub mod nft to components/mod.rs

Description

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Test improvements
• Other (please describe):

Related Issues

Fixes #

Changes Made

Testing

• I have added tests that prove my fix is effective or that my feature works
• All existing tests pass locally
• I have tested this manually

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

Screenshots (if applicable)

Additional Notes

close #330

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