[xcm] Foreign global consensus parachain LocationToAccountId converter (#7016)

* **Foreign** global consensus parachain LocationToAccount converter

* Review fix

* Added `UniversalLocation` + `ensure_is_remote` handling

* Added unique id to encoding

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

Co-authored-by: Gavin Wood <gavin@parity.io>

* Re-export `ensure_is_remote`

* Test

* fmt

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

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

Co-authored-by: Gavin Wood <gavin@parity.io>

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Co-authored-by: parity-processbot <>
Co-authored-by: Gavin Wood <gavin@parity.io>