[generic-template] XCM for foreign assets

[4meta5]

templates

• [X] Generic Runtime Template
• [ ] Evm Template

What is the feature you would like to see?

Partially implemented in #219 but the config could not be configured to match the evm-template's config and compile.

Here is the commit in that PR with the furthest along changes to generic-template for this feature: https://github.com/OpenZeppelin/polkadot-runtime-templates/pull/219/commits/0da33a7f448aca0e073c42f4f48e43b61fb4ab29

Here are the 2 compilation errors at that commit: https://github.com/OpenZeppelin/polkadot-runtime-templates/pull/219#issuecomment-2159579801

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