Foreign Assets reserve backed transfer #978

The implementation of MultiNativeAsset rejects assets whose origin is not from the reserve location.

This is an issue for integrating with foreign assets on Asset Hub as the origin will be Asset Hub Location {parents: 1, interior: X2(Parachain(1000))} and the Asset Location will be {parents: 2, interior: X2(Ethereum, AccountKey20(CONTRACT_ADDRESS))}

This change will need to be made so that we reserve transfer foreign assets.

Here is an example of checking for reserves for Ethereum assets from Asset Hub: https://github.com/Snowfork/polkadot-sdk/blob/snowbridge/cumulus/parachains/runtimes/testing/penpal/src/xcm_config.rs#L319