Rework the Registry to be a public class

[TarikGul]

Summary

I reworked the registry to save on performance, and memory while also exposing a bunch of public functions to the user.

Exposed functions from the registry

// Getter for the complete registry
public get getRegistry

// Getter for the name of the relay chain for this network
public get getRelayChain

// Getter for the registry associated with this networks relay chain
public get getRelaysRegistry

// Lookup all chains that have the following token symbol. It will return an array
// with all the chains that have the following token symbols. Note this will only
// be searched in the respective relay chains registry.
public lookupTokenSymbol(symbol: string)

// Lookup all chains that have the following assetId. It will return an array
// with all the chains that have the following AssetId. Note this will only
// be searched in the respective relay chains registry.
public lookupAssetId(id: string)

// Check whether a parachain id exists within the relay chains registry.
public lookupParachainId(id: string)

// Return the info for a parachain within a relay chains registry.
public lookupParachainInfo(id: string)

[marshacb]

lgtm!