feat(devnet): runtime non-fungibles extensions

[chungquantin]

Implement runtime pallet functionality extensions of the non-fungibles use case

Important

Questionable approach in the set_attribute method and ItemAttribute state query: How can we handle the namespace? Should we dynamically identify the namespace based on the provided origin address? For ItemAttribute, should we simplify it by returning all attributes of the collection item or only one single key-value per call.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.80645% with 23 lines in your changes missing coverage. Please review.

Project coverage is 38.78%. Comparing base (c1132c5) to head (72d7f8f).

Files with missing lines	Patch %	Lines
pallets/api/src/non_fungibles/mod.rs	25.80%	23 Missing ⚠️

@@                          Coverage Diff                          @@
##           chungquatin/runtime-non_fungibles     #266      +/-   ##
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- Coverage                              38.93%   38.78%   -0.15%     
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  Files                                     37       37              
  Lines                                   3277     3305      +28     
  Branches                                3277     3305      +28     
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+ Hits                                    1276     1282       +6     
- Misses                                  1973     1995      +22     
  Partials                                  28       28              

Files with missing lines	Coverage Δ
pallets/api/src/non_fungibles/mod.rs	54.36% <25.80%> (-12.30%)	⬇️