feat: transfer everything out of the gift wallet

[vojtechsimetka]

So this is by no means perfect:

• It does not have any retry mechanism
• it does not correctly check on the UI if the balance is enough for both of the transfers.

But I think it is improvement over what is there right now. I would like to do a complete refactor of this code later (we are creating providers all the time, I think we can better encapsulate things etc).

[bee-worker]

🐝 PR preview in Swarm

Preview URL: https://bah5acgzah6ldlwh5umtuwy5bjhnsgt3r6qigt6fn2vpxigdx4xymokpulgha.bzz.link
Swarm Hash: 3f9635d8fda3274b63a149db234f71f41069f8add55f741877e5f0c729f4598e
Commit Hash: 966ad05
Commit Message: refactor: extract bzz token address into variable

[agazso]

Looks good. Let's try to add retry logic later.