201 representative role approval

[ndkazu]

Motivation
This task concern the asset_management pallet:

• Make the approval call that will be used by the voting system

• write the approval call testing

[codecov-commenter]

Codecov Report

Merging #202 (ddce734) into main (471e031) will decrease coverage by 0.28%.
The diff coverage is 28.57%.

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
- Coverage   78.89%   78.60%   -0.29%     
==========================================
  Files          50       51       +1     
  Lines        4388     4394       +6     
==========================================
- Hits         3462     3454       -8     
- Misses        926      940      +14     

Impacted Files	Coverage Δ
pallets/asset_management/src/functions.rs	0.00% <0.00%> (ø)
pallets/asset_management/src/lib.rs	0.00% <0.00%> (ø)
pallets/roles/src/lib.rs	72.17% <ø> (-1.97%)	⬇️
pallets/roles/src/functions.rs	93.61% <100.00%> (+2.80%)	⬆️
pallets/roles/src/tests.rs	100.00% <100.00%> (ø)
pallets/roles/src/types.rs	94.00% <100.00%> (+0.12%)	⬆️

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