Add and configure asset registry pallet (#276)

* Add asset_registry.rs to runtime/common

* Add asset registry pallet to Foucoco runtime

* Add asset registry pallet to Amplitude runtime

* Add asset registry pallet to Pendulum runtime

* Add benchmarking logic for orml_asset_registry.rs to runtime/common

* Add benchmarked weights for orml-asset-registry

* Change call filters

* Enable benchmarks for asset registry in all runtimes

* Configure asset_registry in chain_spec.rs

* Update Cargo.lock

* Fix missing dependencies of orml_asset_registry.rs

* Configure runtime-common/try-runtime features for runtimes

* Rewrite AssetAuthority type
Pass the EnsureRoot to another type instead of implementing the whole trait

* Add instructions for benchmarking to README.md

* Use Some(Currency) in benchmarks

* Generate benchmarks for orml_asset_registry pallet
for all runtimes

* Bump spacewalk dependencies
This is necessary to have the latest CustomMetadata

* Adjust CustomMetadata struct usage

* Add comment to construct_runtime! macros

* Fix misconfiguration in foucoco Cargo.toml

* Re-generate benchmark weights for asset registry pallet