Refactor/foreign assets as thin proxy #2225

Job	Run time
canary	0s
forkless-update-data	0s
collator-selection	0s
forkless-update-no-data	0s
governance	0s
polkadot-types	0s
try-runtime	0s
node-only-update	0s
codestyle / clippy	2m 35s
codestyle / rustfmt	14s
codestyle / yarn_eslint	29s
unit-test / develop	11m 15s
xcm / Prepare execution matrix	26s
yarn-dev / opal	32m 1s
yarn-dev / sapphire	28m 16s
yarn-dev / quartz	42m 1s
yarn-dev / unique	41m 13s
xcm / opal	1h 23m 29s
xcm / quartz	2h 47m 48s
xcm / unique	2h 57m 54s
	9h 47m 41s

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