Configure XCM Asset Transfer and Teleportation

[asiniscalchi]

As a developer, I want to update the XCM configuration to handle teleportation and asset transfers, ensuring the chain’s native asset reserve is correctly used with a proper IsConcrete trait.

"If the intention is to teleport the chain’s native asset it should handle its own reserve inside the IsConcrete trait. This can be achieved by using Location::here() instead of the relay's location."

This AssetTransactor is only handling relay tokens, which does not seem
to be the intended use case. If the intention is to teleport the chain’s
native asset it should handle its own reserve inside the IsConcrete trait.
This can be achieved by using Location::here() instead of the relay's
location.