fee by xcm_interface

[zqhxuyuan]

closes: #1936

• init Statemine migration

[codecov]

Codecov Report

Merging #1940 (a5e3224) into master (dc26c9a) will decrease coverage by 0.51%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1940      +/-   ##
==========================================
- Coverage   86.29%   85.77%   -0.52%     
==========================================
  Files          91       91              
  Lines       19197    18440     -757     
==========================================
- Hits        16566    15817     -749     
+ Misses       2631     2623       -8     

Impacted Files	Coverage Δ
modules/support/src/lib.rs	33.33% <ø> (ø)
modules/xcm-interface/src/lib.rs	0.00% <0.00%> (ø)
modules/currencies/src/lib.rs
modules/currencies/src/tests.rs
rpc/src/lib.rs	0.00% <0.00%> (ø)
primitives/src/currency.rs	58.18% <0.00%> (ø)

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[ferrell-code]

lgtm