Add stake_cw721 and cw721-controllers

[cypherape]

Adds the ability to stake Cw721 Tokens. Allows for staked Nft use cases.

Closes #131

[codecov-commenter]

Codecov Report

Merging #309 (2038656) into main (5798da4) will decrease coverage by 0.60%.
The diff coverage is 91.32%.

@@            Coverage Diff             @@
##             main     #309      +/-   ##
==========================================
- Coverage   96.37%   95.76%   -0.61%     
==========================================
  Files          29       32       +3     
  Lines        4797     5290     +493     
==========================================
+ Hits         4623     5066     +443     
- Misses        174      224      +50     

Impacted Files	Coverage Δ
contracts/cw-core/src/contract.rs	95.65% <80.95%> (-1.16%)	⬇️
packages/cw-paginate/src/lib.rs	88.13% <81.81%> (-11.87%)	⬇️
contracts/cw721-stake/src/contract.rs	84.05% <84.05%> (ø)
packages/cw721-controllers/src/nft_claim.rs	98.91% <98.91%> (ø)
contracts/cw20-stake/src/contract.rs	93.34% <100.00%> (+0.01%)	⬆️
contracts/cw721-stake/src/hooks.rs	100.00% <100.00%> (ø)

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[0xekez]

This is looking really great. Thanks for putting this up! Made a pass and added some comments. Will make another one once those are discussed.

[0xekez]

Rewards are hard and I think this has a bug where one can drain rewards from the contract. I missed this in the first review and an older version of the staking contract actually had the same problem. Many have struggled with this one. :)

My recommendation would be that we just rip rewards out of this contract for now. The nice thing about these contracts is that they can always be upgraded later so we can start simple. :)

[Callum-A]

LGTM, some small nits