Function getTransferStrategyRulesGroupedByStrategy

getTransferStrategyRulesGroupedByStrategy(queryable): Promise<Map<string, Map<string, TransferStrategyRuleAmount[]>>>
Fetches all transfer strategy rules, configured on the chain, grouped by strategies and assets

The return type can be read as:
```
Map<
    strategyName: string,
    Map<assetId: string, TransferStrategyRuleAmount[]>
>
```
where assetId will be "all" if a certain strategy accepts all assets
Parameters
- queryable: Queryable
  object to use when querying the blockchain
Returns Promise<Map<string, Map<string, TransferStrategyRuleAmount[]>>>
a map of transfer strategy rules grouped by strategies and assets.