Centrifuge chain NFT

[vedhavyas]

This PR brings the following changes:

• NFT Minting, OwnerOf, and Transfer service functions
• Centrifuge protobufs are modified to not pad the registry and keep it 20 bytes for Cent chain while keeping 32byte padding for eth registries. PR here - https://github.com/centrifuge/centrifuge-protobufs/pull/125/files
• To accommodate the change in protobufs, I had to change the precise proofs to allow not having fixed length for the slices with mapping field. PR here - https://github.com/centrifuge/precise-proofs/pull/97/files
• Chain bridge docker is updated to fix some issues with reading events specific to minting. PR here - Bridge updates ChainBridge#3

Next:

• Once the above PRs are in and this one merged, one more PR to add the HTTP endpoints with testworld tests connecting the service functions we defined here

PS: Please ensure you have reviewed the above PR before reviewing this PR for context. Thanks!

[codecov]

Codecov Report

Merging #1469 (06eb9ae) into develop (b3995b9) will increase coverage by 0.37%.
The diff coverage is 65.46%.

@@             Coverage Diff             @@
##           develop    #1469      +/-   ##
===========================================
+ Coverage    66.69%   67.06%   +0.37%     
===========================================
  Files          130      130              
  Lines         8301     8525     +224     
===========================================
+ Hits          5536     5717     +181     
+ Misses        2149     2138      -11     
- Partials       616      670      +54     

Impacted Files	Coverage Δ
documents/entity/model.go	70.10% <0.00%> (ø)
documents/entityrelationship/model.go	74.26% <ø> (ø)
documents/generic/model.go	50.79% <0.00%> (ø)
nft/nft.go	47.36% <ø> (ø)
nft/chain_api.go	53.91% <42.69%> (-38.68%)	⬇️
centchain/api.go	73.56% <57.89%> (+23.56%)	⬆️
nft/service.go	68.18% <75.43%> (-0.61%)	⬇️
nft/jobs.go	72.06% <78.21%> (-0.19%)	⬇️
anchors/service.go	53.19% <100.00%> (ø)
documents/read_acls.go	80.64% <100.00%> (+0.23%)	⬆️
... and 3 more

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[mikiquantum]

Thanks @vedhavyas !