Bitcoin backend to manage the list of wallets

**Feature description**

List Bitcoin wallets

**Is your feature request related to a problem? Please describe.**
Bitcoin wallets not listed in user interface after #208

**Describe the solution you'd like**
Wallets should be added in GUI , in a similar way to image shown below, but adapted to BTC


**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
Needs #177 to render full BIP44 account and address tree . Needs #178 for fast

**Possible implementation**

- [ ] Implement Bitcoin wallet storage compatible with Electrum
- [ ] Implement Bitcoin wallet set based on previous component