[Staking] Attribute adjustment

[DidacSF]

Description

This PR replaces the previously generic NFT Attribute in the nft-staking pallet, with a fixed type, AttributeValue. This type has the following signature:

pub const MAX_BYTES_PER_ATTRIBUTE: u32 = 32;

pub type AttributeValue = BoundedVec<u8, ConstU32<MAX_BYTES_PER_ATTRIBUTE>>;

This allows flexiblity, since we can have attributes only use on byte of the vec while others may use the full 32 bytes. This also makes it easier to verify the contents and make comparisons between values.

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: 20.00% and no project coverage change.

Comparison is base (7230c4b) 75.81% compared to head (fdcf183) 75.81%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #343   +/-   ##
========================================
  Coverage    75.81%   75.81%           
========================================
  Files           33       33           
  Lines         3444     3444           
========================================
  Hits          2611     2611           
  Misses         833      833           

Files Changed	Coverage Δ
pallets/ajuna-nft-staking/benchmarking/src/lib.rs	0.00% <0.00%> (ø)
pallets/ajuna-nft-staking/src/lib.rs	80.00% <0.00%> (ø)
pallets/ajuna-nft-staking/src/contracts.rs	93.54% <100.00%> (ø)

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[darkfriend77]

approve