Convert Portfolio WSS to new public WSS feed

[NBMSacha]

Mobula App is currently using legacy https://docs.mobula.io/api-reference/endpoint/wss-complete-data WSS complete data, which isn't a real WSS feed but just a hack to load the data faster.

I'd be much better for the user experience & for the codebase harmony to implement the new one:
https://docs.mobula.io/api-reference/endpoint/wss-portfolio

Which actually provides balances refresh thus real "real-time" data feed for the users.

Changes would be on all parts of the codebase implementing the legacy WSS - would also be great to use Mobula API SDK for the stream, which provides type safety out of the box.

Multiple things must be done on the API side first:

• Coverage for multi-wallet & custom portfolios on WSS

• Implementation on the API SDK

• Adding "first-load" render to the new WSS feed (optional) to keep it as fast as it was before.

I'm opening this issue to keep track of it, but yet nothing has to be implemented on the app end.