move xcm config to seperate file

[zqhxuyuan]

closes: #1885
move xcm related config to seperate file including:

• pallet_xcm
• cumulus_pallet_xcm
• orml_xtokens
• module_xcm_interface.

[codecov]

Codecov Report

Merging #1903 (3230a41) into master (52f7062) will decrease coverage by 0.38%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1903      +/-   ##
==========================================
- Coverage   85.56%   85.18%   -0.39%     
==========================================
  Files          80       79       -1     
  Lines       17058    17330     +272     
==========================================
+ Hits        14596    14762     +166     
- Misses       2462     2568     +106     

Impacted Files	Coverage Δ
modules/evm/src/runner/state.rs	48.15% <0.00%> (-6.91%)	⬇️
modules/evm/rpc/src/lib.rs	10.63% <0.00%> (-0.38%)	⬇️
primitives/src/unchecked_extrinsic.rs	0.00% <0.00%> (ø)
modules/evm/rpc/runtime_api/src/lib.rs	0.00% <0.00%> (ø)
modules/evm/src/runner/storage_meter.rs	97.08% <0.00%> (ø)
rpc/src/lib.rs
modules/evm/src/tests.rs	99.26% <0.00%> (+0.04%)	⬆️
modules/evm/src/lib.rs	65.03% <0.00%> (+0.92%)	⬆️
modules/evm/src/runner/stack.rs	57.88% <0.00%> (+2.32%)	⬆️
modules/evm/src/precompiles.rs	55.93% <0.00%> (+5.56%)	⬆️
... and 1 more

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