feat(nonfungibles): add pallet-api/nonfungibles

[chungquantin]

Description

Implement the runtime pallet pallet-api/nonfungibles for the #259. This implementation follows the discussed NFT spec with the forked pallet-nfts.

Linked PRs

• Weight & benchmarking PR: feat(api/nonfungibles): destroy collection witness data & weights #383

Pallet: pallet-api/nonfungibles

• Implement basic functionalities of the pallet-api/nonfungibles.
• Configure pallet-nfts and pallet-api/nonfungibles to Test runtime in mock.rs
  • refactor: pallet tests of pallet-api/fungibles to use an updated Account instead of u8. (.e.g, account(ALICE))
• pallet unit testing with pallet-nonfungibles.

[chungquantin]

Could this parameter be changed to Vec and we handle the length check in the runtime, so contract api implementation does not need to handle it?

[chungquantin]

Should this TODO be tackled in this PR?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.31058% with 137 lines in your changes missing coverage. Please review.

Project coverage is 71.42%. Comparing base (9d1658e) to head (841035a).

Files with missing lines	Patch %	Lines
pallets/api/src/nonfungibles/weights.rs	50.00%	64 Missing ⚠️
pallets/api/src/nonfungibles/mod.rs	72.72%	32 Missing and 13 partials ⚠️
pallets/api/src/mock.rs	8.69%	21 Missing ⚠️
pallets/api/src/nonfungibles/benchmarking.rs	0.00%	5 Missing ⚠️
pallets/api/src/nonfungibles/tests.rs	99.76%	1 Missing and 1 partial ⚠️

@@                    Coverage Diff                     @@
##           chungquantin/feat-nfts     #388      +/-   ##
==========================================================
+ Coverage                   69.57%   71.42%   +1.84%     
==========================================================
  Files                          69       73       +4     
  Lines                       12222    13394    +1172     
  Branches                    12222    13394    +1172     
==========================================================
+ Hits                         8504     9566    +1062     
- Misses                       3448     3545      +97     
- Partials                      270      283      +13     

Files with missing lines	Coverage Δ
pallets/api/src/nonfungibles/tests.rs	99.76% <99.76%> (ø)
pallets/api/src/nonfungibles/benchmarking.rs	0.00% <0.00%> (ø)
pallets/api/src/mock.rs	55.31% <8.69%> (-44.69%)	⬇️
pallets/api/src/nonfungibles/mod.rs	72.72% <72.72%> (ø)
pallets/api/src/nonfungibles/weights.rs	50.00% <50.00%> (ø)

... and 3 files with indirect coverage changes

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