Simplification of structure

Instead of typing:
```javascript
const client = getClient("bsx")
const query = client.collectionListByIssuer('vikiival')
```
and keeping track of the client, or reinitializing it all over and over again, it could be better to just have one static client, that would be used like this:
```javascript
const query = bsx.collectionListByIssuer('vikiival')
```