[Staking] Multi rewards and statistics

[DidacSF]

Description

This PR adds the features mentioned here:

• https://ajunanetwork.atlassian.net/browse/ABO-154
• https://ajunanetwork.atlassian.net/browse/ABO-158

Type of changes

• build: Changes that affect the build system or external dependencies (eg, Cargo, Docker)
• ci: Changes to CI configuration
• docs: Changes to documentation only
• feat: Changes to add a new feature
• fix: Changes to fix a bug
• refactor: Changes that do not alter functionality
• style: Changes to format the code
• test: Changes to add missing tests or correct existing tests

Checklist

• Tests for the changes have been added
• Necessary documentation is added (if appropriate)
• Formatted with cargo fmt --all
• Linted with cargo clippy --all-features --all-targets
• Tested with cargo test --workspace --all-features --all-targets

[codecov]

Codecov Report

Patch coverage: 86.48% and project coverage change: +0.09% 🎉

Comparison is base (0d6f4d1) 75.85% compared to head (e10eb06) 75.94%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #348      +/-   ##
===========================================
+ Coverage    75.85%   75.94%   +0.09%     
===========================================
  Files           33       33              
  Lines         3463     3476      +13     
===========================================
+ Hits          2627     2640      +13     
  Misses         836      836              

Files Changed	Coverage Δ
pallets/ajuna-nft-staking/benchmarking/src/lib.rs	0.00% <ø> (ø)
pallets/ajuna-nft-staking/src/contracts.rs	93.54% <ø> (ø)
pallets/ajuna-nft-staking/src/lib.rs	81.07% <86.48%> (+0.80%)	⬆️

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[darkfriend77]

good