Refactor/foreign assets as thin proxy #2222

Job	Run time
collator-selection	0s
canary	0s
forkless-update-data	0s
forkless-update-no-data	0s
node-only-update	0s
governance	0s
try-runtime	0s
codestyle / rustfmt	13s
codestyle / clippy	2m 12s
codestyle / yarn_eslint	30s
unit-test / develop	3m 47s
xcm / Prepare execution matrix	12s
yarn-dev / opal	3m 34s
yarn-dev / sapphire	3m 32s
yarn-dev / quartz	3m 34s
yarn-dev / unique	3m 38s
xcm / opal	3m 17s
xcm / quartz	3m 15s
xcm / unique	3m 16s
	31m 0s

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