Feat: Network Fee from Boost

[msgmaxim]

Pull Request

Closes: PRO-1778

Summary

• New storage item: NetworkFeeDeductionFromBoostPercents representing the % of boost fee to be taken as network fee. Its value is initially 0, and can be updated via update_pallet_config governance extrinsic.
• When a deposit is boosted, the full boost fee is "deducted" from the deposit, but we now apply network fee reduction when recording the amounts to be credited to boosters upon finalisation.
• When a boosted deposit is finalised, we add up all funds credited to boosters, and any non-zero excees amount is swaped into FLIP as network fee. (The swap request's type being NetworkFee takes care of the resulting flip being scheduled for burning later.)
• DepositFinalised (when action is BoostersCredited) now additionally exposes network_fee_swap_request_id (of the network fee swap), and network_fee_from_boost (the amount of input asset to be swapped).
• Added network_fee_deduction to cf_boost_pool_details rpc.
• Added tests that should cover all new behaviour.

I haven't added network_fee_decution to DepositBoosted (there still seems to be an ongoing discussion whether this should be necessary), but it shouldn't be too difficult to add if needed (though maybe with a name indicating that it is not confirmed?).

[codecov]

Codecov Report

Attention: Patch coverage is 91.15385% with 23 lines in your changes missing coverage. Please review.

Project coverage is 72%. Comparing base (09292c9) to head (9390705).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
state-chain/pallets/cf-ingress-egress/src/lib.rs	71%	18 Missing and 1 partial ⚠️
...-chain/pallets/cf-ingress-egress/src/boost_pool.rs	87%	1 Missing and 1 partial ⚠️
state-chain/runtime/src/lib.rs	33%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##            main   #5495    +/-   ##
======================================
- Coverage     72%     72%    -0%     
======================================
  Files        495     495            
  Lines      88124   88254   +130     
  Branches   88124   88254   +130     
======================================
+ Hits       63144   63170    +26     
- Misses     22401   22516   +115     
+ Partials    2579    2568    -11     

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[kylezs]

Nice one 👌 only pretty minor things

[dandanlen]

👌