Small improvements algo weights

[HenriqueNogara]

Small improvements to cusip, isin and lei algorithms. Move identity constants to primitives.

[codecov[bot]]

Codecov Report

Merging #1504 (49d98c4) into develop (7551e6e) will decrease coverage by 0.03%. The diff coverage is 87.15%.

@@             Coverage Diff             @@
##           develop    #1504      +/-   ##
===========================================
- Coverage    54.00%   53.97%   -0.03%     
===========================================
  Files          145      145              
  Lines        32484    32501      +17     
===========================================
+ Hits         17543    17544       +1     
- Misses       14941    14957      +16     

Files Changed	Coverage Δ
pallets/identity/src/keys.rs	84.65% <ø> (-0.75%)	:arrow_down:
primitives/src/identity.rs	84.61% <ø> (ø)
primitives/src/asset_identifier.rs	93.99% <85.71%> (-3.94%)	:arrow_down:
pallets/common/src/traits/identity.rs	10.84% <92.85%> (+6.92%)	:arrow_up:
pallets/committee/src/lib.rs	77.31% <100.00%> (+0.10%)	:arrow_up:

... and 3 files with indirect coverage changes