feat: add cache to registry

[marshacb]

• adds cache to the registry
• caches queried assets, foreign assets, and pool assets
• defaults to reading from the cache, followed by the assets registry and chain state

closes: #225

[TarikGul]

From an initial look. I think the registry should have implemented getters and setters that either look for a given item in the cache, or set an item in the cache.

For example:

class Registry {
    constructor() {
        ....
        this.cache = {
            ...
        }
    }
    
    public cacheLookupAsset(assetId: string) {
        
    }
    
    public cacheAddAsset(assetId: string) {
    
    }
}

NOTE: We already know the specname, and the relaychain so we dont need those values as args.

[marshacb]

From an initial look. I think the registry should have implemented getters and setters that either look for a given item in the cache, or set an item in the cache.

For example:

class Registry {
    constructor() {
        ....
        this.cache = {
            ...
        }
    }
    
    public cacheLookupAsset(assetId: string) {
        
    }
    
    public cacheAddAsset(assetId: string) {
    
    }
}

NOTE: We already know the specname, and the relaychain so we dont need those values as args.

great idea! Ill modify this to reflect the getter setter structure

[TarikGul]

Some additional thoughts.

1. For setting items in the cache since we have specific types it would either need to take in a second arg called type (or something like it) that tells us whether the assetId is a LP token, FA token, or just regular asset part of the assets pallet.

OR

2. We can have multiple methods, setForeignAssetInCache, setLiquidPoolTokenInCache, etc. That way each assetId can be a different format>

OR

3. We can be more generic for (2), and have a single function that has two args:

type GenericAsset<T> = T extends 'foreignAsset'
	? <some_type>
	: T extends 'liquidPools'
	? <some_type>
	: T extends 'assetpallet'
	? <some_type>
	: never;
	
...
public setAssetIdInCache<T>(asset: GenericAsset<T>, type: T)
...

[TarikGul]

Just some nits to address on the above. But overall really solid PR!

[TarikGul]

Some small nits, but really amazing job!