Asset Registry (#63)

* bootstrap pallet_asset_registry

* rm change_foreign_asset fn

* fix AsAssetMultiLocation implementation

* avoid creating/destroying assets for registry

* use loose coupling with Assets pallet

* split unit tests

* bootstrap xcm-simulator unit tests

* rustfmt

* rm change_foreign_asset extrinsic

* rename Foreign Asset -> Reserve Asset

* rm xcm-simulator from unit tests

* rename ForeignFungiblesTransactor->ReservedFungiblesTransactor

* add comments to asset-registry pallet errors

* bootstrap integration-tests

* asset-registry pallet README

* zombienet with 2 collators per para

* bootstrap benchmarks

* upgrade zombienet config camel_case

* update weights with GCP c2d-highcpu-8

* integration test: rm XcmV1MultiLocation attribute from ReserveAssetRegistered event

* rm unused StatemineAssetIdInfoB

* add WeightInfo to asset-registry mock

* Run cargo fmt & clippy

* More clippy smartness

* lint pallets/asset-registry/README.md

Co-authored-by: Adam Wierzbicki <[email protected]>

* lint pallets/asset-registry/README.md

Co-authored-by: Adam Wierzbicki <[email protected]>

* lint pallets/asset-registry/README.md

Co-authored-by: Adam Wierzbicki <[email protected]>

* lint pallets/asset-registry/README.md

Co-authored-by: Adam Wierzbicki <[email protected]>

* lint pallets/asset-registry/src/benchmarking.rs

Co-authored-by: Adam Wierzbicki <[email protected]>

* lint pallets/asset-registry/src/tests.rs

Co-authored-by: Adam Wierzbicki <[email protected]>

* lint pallets/asset-registry/src/tests.rs

Co-authored-by: Adam Wierzbicki <[email protected]>

* lint primitives/xcm/Cargo.toml

Co-authored-by: Adam Wierzbicki <[email protected]>

* lint primitives/xcm/src/lib.rs

Co-authored-by: Adam Wierzbicki <[email protected]>

* lint primitives/xcm/src/lib.rs

Co-authored-by: Adam Wierzbicki <[email protected]>

* lint pallets/asset-registry/src/benchmarking.rs

Co-authored-by: Adam Wierzbicki <[email protected]>

* lint pallets/asset-registry/src/lib.rs

Co-authored-by: Adam Wierzbicki <[email protected]>

* lint pallets/asset-registry/src/lib.rs

Co-authored-by: Adam Wierzbicki <[email protected]>

* lint pallets/asset-registry/src/tests.rs

Co-authored-by: Adam Wierzbicki <[email protected]>

* fix ReserveAssetRegistered field

* add comment explaining fn asset_exists

* fix asset-registry pallet README

* set LOCAL_ASSET_ID to 10

* change &trappist_asset_id on integration test

Co-authored-by: Steve Degosserie <[email protected]>
Co-authored-by: Adam Wierzbicki <[email protected]>