[XCM] Benchmarks

[Hounsette]

Adding benchmarks for the pallet xcm.

[codecov]

Codecov Report

Merging #716 (dbf4c2b) into master (e4ab801) will decrease coverage by 1.92%.
The diff coverage is 0.73%.

@@            Coverage Diff             @@
##           master     #716      +/-   ##
==========================================
- Coverage   77.07%   75.16%   -1.92%     
==========================================
  Files          44       47       +3     
  Lines       11755    12054     +299     
==========================================
  Hits         9060     9060              
- Misses       2695     2994     +299     

Impacted Files	Coverage Δ
pallets/grants/src/weights.rs	0.00% <0.00%> (ø)
pallets/reserve/src/weights.rs	0.00% <0.00%> (ø)
pallets/staking/src/mock.rs	92.68% <0.00%> (ø)
runtimes/eden/src/lib.rs	2.65% <0.00%> (-0.06%)	⬇️
runtimes/eden/src/weights/frame_system.rs	0.00% <0.00%> (ø)
runtimes/eden/src/weights/mod.rs	0.00% <0.00%> (ø)
runtimes/eden/src/weights/pallet_balances.rs	0.00% <0.00%> (ø)
...imes/eden/src/weights/pallet_collator_selection.rs	0.00% <0.00%> (ø)
runtimes/eden/src/weights/pallet_contracts.rs	0.00% <0.00%> (ø)
runtimes/eden/src/weights/pallet_membership.rs	0.00% <0.00%> (ø)
... and 10 more

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[aliXsed]

@Hounsette we need to change the Weigher in the xcm_config.rs to use WeightInfoBounds instead of FixedWeightBounds. Have a look at KusamaXcmWeight as an example and the way it has used the results of the benchmarking from both the generic and the fungible benchmarks.

[simonsso]

@Hounsette this rebase I did was not successful, please force push your last commit again.