[ABO-138] Add season_id as Avatar NFT attribute

[DidacSF]

Description

See https://ajunanetwork.atlassian.net/browse/ABO-138 for details.

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: 100.00% and no project coverage change.

Comparison is base (76120dc) 74.97% compared to head (71f3d05) 74.98%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #337   +/-   ##
========================================
  Coverage    74.97%   74.98%           
========================================
  Files           33       33           
  Lines         3421     3422    +1     
========================================
+ Hits          2565     2566    +1     
  Misses         856      856           

Files Changed	Coverage Δ
...lets/ajuna-awesome-avatars/src/types/avatar/nft.rs	100.00% <100.00%> (ø)

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