Mesh 2108/settlement improvements

[HenriqueNogara]

Adds new extrinsics that allow users to pass the number of assets on the sender/receiver side being sent from portfolios to calculate the fee in advance.

changelog

new features

• Adds the affirm_with_receipts_with_count extrinsic;
• Adds the affirm_instruction_with_count extrinsic;
• Adds the withdraw_affirmation_with_count extrinsic;
• Adds the reject_instruction_with_count extrinsic;
• Adds the get_affirmation_count rpc call;

modified API

• The following types were added to the json schema: AssetCount, AffirmationCount;
• The following rpc calls were added to the json schema: get_affirmation_count;

modified logic

[codecov[bot]]

Codecov Report

Merging #1536 (9c48b57) into develop (612bda0) will increase coverage by 0.35%. The diff coverage is 89.47%.

@@             Coverage Diff             @@
##           develop    #1536      +/-   ##
===========================================
+ Coverage    58.31%   58.66%   +0.35%     
===========================================
  Files          142      142              
  Lines        31505    31873     +368     
===========================================
+ Hits         18372    18699     +327     
- Misses       13133    13174      +41     

Files	Coverage Δ
pallets/runtime/develop/src/runtime.rs	3.65% <ø> (ø)
pallets/sto/src/lib.rs	50.21% <100.00%> (+0.10%)	:arrow_up:
pallets/weights/src/pallet_settlement.rs	63.81% <100.00%> (+8.52%)	:arrow_up:
primitives/src/settlement.rs	82.27% <93.22%> (+1.30%)	:arrow_up:
pallets/runtime/common/src/runtime.rs	1.75% <0.00%> (-0.04%)	:arrow_down:
pallets/common/src/traits/settlement.rs	40.93% <85.36%> (+40.93%)	:arrow_up:
pallets/settlement/src/lib.rs	75.99% <90.66%> (+1.76%)	:arrow_up:

... and 3 files with indirect coverage changes