New Incentives Contract

[songwongtp]

• split functionality of incentives contract into 2 contracts
• Proxy contains functions regarding to rebalance and arbitrage
• Incentives now contains only reward contribution logic. Also rebalance contribution now is only recorded when reward incurs, i.e. penalty > 0

[codecov]

Codecov Report

Merging #160 (baa5b30) into main (c24615f) will increase coverage by 0.13%.
The diff coverage is 99.01%.

@@            Coverage Diff             @@
##             main     #160      +/-   ##
==========================================
+ Coverage   96.98%   97.12%   +0.13%     
==========================================
  Files          36       40       +4     
  Lines        3384     3443      +59     
==========================================
+ Hits         3282     3344      +62     
+ Misses        102       99       -3     

Impacted Files	Coverage Δ
contracts/nebula-incentives/src/state.rs	97.10% <ø> (ø)
contracts/nebula-incentives/src/query.rs	95.74% <95.74%> (ø)
contracts/nebula-incentives/src/handle_records.rs	98.46% <98.46%> (ø)
contracts/nebula-incentives/src/contract.rs	100.00% <100.00%> (+1.25%)	⬆️
contracts/nebula-incentives/src/handle_rewards.rs	96.82% <100.00%> (ø)
contracts/nebula-proxy/src/arbitrageurs.rs	98.24% <100.00%> (ø)
contracts/nebula-proxy/src/contract.rs	100.00% <100.00%> (ø)
contracts/nebula-proxy/src/rebalancers.rs	97.05% <100.00%> (ø)
contracts/nebula-proxy/src/state.rs	100.00% <100.00%> (ø)

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