feat: Expose zero remaining value orders from cf_pool_orders RPC

[marcellorigotti]

Pull Request

Closes: PRO-1462

Checklist

Please conduct a thorough self-review before opening the PR.

• I am confident that the code works.
• I have updated documentation where appropriate.

Summary

Add optional parameter to cf_pool_orders (filled_orders: Option<bool>)

• Default to false if not specified
• If set to true orders with an amount of 0 (filled orders) are included in the response, otherwise they are excluded (previous behaviour)
• open_order_count includes these empty orders

[codecov]

Codecov Report

Attention: Patch coverage is 40.74074% with 16 lines in your changes missing coverage. Please review.

Project coverage is 71%. Comparing base (fe8b41b) to head (18c2b33).

Files	Patch %	Lines
state-chain/custom-rpc/src/lib.rs	0%	8 Missing ⚠️
state-chain/pallets/cf-pools/src/lib.rs	25%	6 Missing ⚠️
state-chain/runtime/src/lib.rs	0%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##            main   #5042    +/-   ##
======================================
- Coverage     71%     71%    -0%     
======================================
  Files        441     441            
  Lines      76362   76229   -133     
  Branches   76362   76229   -133     
======================================
- Hits       54567   54363   -204     
- Misses     18915   18977    +62     
- Partials    2880    2889     +9     

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