Add ERC721 diamond

[joYyHack]

• Since this PR suggests a bug fix, the tests have been added and the coverage is 100%.
• Since this PR introduces a new feature, the update has been discussed in an Issue or with the team.
• This PR is just a minor change, like a typo fix.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (abb78ee) 100.00% compared to head (618a807) 100.00%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##            master       #68    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           38        40     +2     
  Lines         1482      1658   +176     
  Branches       193       232    +39     
==========================================
+ Hits          1482      1658   +176     

Files	Coverage Δ
...cts/contracts-registry/pools/proxy/ProxyBeacon.sol	100.00% <100.00%> (ø)
contracts/diamond/tokens/ERC721/DiamondERC721.sol	100.00% <100.00%> (ø)
...cts/diamond/tokens/ERC721/DiamondERC721Storage.sol	100.00% <100.00%> (ø)
contracts/tokens/SBT.sol	100.00% <100.00%> (ø)

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[Arvolear]

Please update 2 package.jsons versions. Let's use 2.6.5

[Arvolear]

LGTM!