feat: Omnipool

[enthusiastmartin]

Omnipool implementation.

TODO:

• [x] Imbalances/TVL updates
• [x] Few clarifications about math ( marked as TODO: ask colin ).
• [x] Tests
• [x] Benchmarks

[codecov[bot]]

Codecov Report

Base: 67.54% // Head: 84.43% // Increases project coverage by +16.89% :tada:

Coverage data is based on head (94d3415) compared to base (28ef5b0). Patch coverage: 86.70% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #396       +/-   ##
===========================================
+ Coverage   67.54%   84.43%   +16.89%     
===========================================
  Files           5        8        +3     
  Lines         114      964      +850     
===========================================
+ Hits           77      814      +737     
- Misses         37      150      +113     

Impacted Files	Coverage Δ
pallets/omnipool/src/types.rs	81.08% <81.08%> (ø)
pallets/omnipool/src/lib.rs	84.67% <84.67%> (ø)
pallets/omnipool/src/benchmarks.rs	100.00% <100.00%> (ø)

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[mrq1911]

target should be changed to hydra-parachain

[github-actions[bot]]

New crates:

• pallet-omnipool: v1.0.0

Runtime version has not been increased.