[Staking] Adjusting types of Avatar attributes on NFT conversion

[DidacSF]

Description

This PR aims at changing the typing of the NFT attribute in the NFTConvertible interface exposed in the pallet-ajuna-nft-transfer. Many supporting changes have been applied in order for it to work as expected.

Type of changes

• build: Changes that affect the build system or external dependencies (eg, Cargo, Docker)
• ci: Changes to CI configuration
• docs: Changes to documentation only
• feat: Changes to add a new feature
• fix: Changes to fix a bug
• refactor: Changes that do not alter functionality
• style: Changes to format the code
• test: Changes to add missing tests or correct existing tests

Checklist

• Tests for the changes have been added
• Necessary documentation is added (if appropriate)
• Formatted with cargo fmt --all
• Linted with cargo clippy --all-features --all-targets
• Tested with cargo test --workspace --all-features --all-targets

[codecov]

Codecov Report

Patch coverage: 84.84% and project coverage change: +0.01% 🎉

Comparison is base (68b3763) 75.81% compared to head (595d55b) 75.82%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #345      +/-   ##
===========================================
+ Coverage    75.81%   75.82%   +0.01%     
===========================================
  Files           33       33              
  Lines         3444     3454      +10     
===========================================
+ Hits          2611     2619       +8     
- Misses         833      835       +2     

Files Changed	Coverage Δ
pallets/ajuna-awesome-avatars/src/lib.rs	83.04% <ø> (ø)
pallets/ajuna-nft-transfer/src/lib.rs	82.92% <66.66%> (ø)
...lets/ajuna-awesome-avatars/src/types/avatar/nft.rs	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[darkfriend77]

good.