Improve settlement weight estimate

[Neopallium]

changelog

modified logic

• The transactionPaymentApi and transactionPaymentCallApi Runtime API now check if the call is for the Settlement pallet and gets the actual weight for affirmInstruction, affirmWithReceipts, rejectInstruction and withdrawAffirmation calls.

[codecov[bot]]

Codecov Report

Merging #1528 (ae5a00f) into develop (5a139cd) will decrease coverage by 0.10%. The diff coverage is 6.57%.

@@             Coverage Diff             @@
##           develop    #1528      +/-   ##
===========================================
- Coverage    58.43%   58.33%   -0.10%     
===========================================
  Files          142      142              
  Lines        31446    31505      +59     
===========================================
+ Hits         18374    18378       +4     
- Misses       13072    13127      +55     

Files	Coverage Δ
pallets/runtime/common/src/runtime.rs	1.78% <0.00%> (-0.04%)	:arrow_down:
pallets/transaction-payment/src/lib.rs	47.79% <16.66%> (-1.48%)	:arrow_down:
pallets/settlement/src/lib.rs	74.29% <0.00%> (-1.24%)	:arrow_down:

... and 4 files with indirect coverage changes