feat: add generic create registry asset which accepts asset type

[enthusiastmartin]

This PR refactors registry trait for asset creation. Previously it was not possible to specify asset type as parameter, so there was not a way to create other assets than share PoolAsset type.

With new types, Stableswap and Bond, it is required to register such type trhough some kind of generic interface.

Hence, the new CreateRegistry trait.

[github-actions]

Crate versions that have been updated:

• pallet-asset-registry: v2.2.3 -> v2.2.4
• hydradx-traits: v2.4.0 -> v2.5.0

Runtime version has not been increased.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.06% ⚠️

Comparison is base (c7fa065) 65.01% compared to head (b935014) 64.95%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #649      +/-   ##
==========================================
- Coverage   65.01%   64.95%   -0.06%     
==========================================
  Files         137      138       +1     
  Lines        9899     9908       +9     
==========================================
  Hits         6436     6436              
- Misses       3463     3472       +9     

Files Changed	Coverage Δ
pallets/asset-registry/src/lib.rs	83.92% <0.00%> (-1.53%)	⬇️
pallets/asset-registry/src/types.rs	0.00% <0.00%> (ø)
traits/src/registry.rs	0.00% <ø> (ø)

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