Fungibles adapter and MultiLocation::X8 (#2662)

* Fungibles adapter and MultiLocation::X8

* Comments

* Comment & whitespace

* Fix up CI/CD for the new labels.

* Fix labels

* Whitespace

* Fixes

* Update Cargo.lock

* Update xcm/xcm-builder/src/fungibles_adapter.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
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