Stellar backend to manage the list of wallets

**Feature description**

List Ethereum wallets

**Is your feature request related to a problem? Please describe.**
Stellar wallets not listed in user interface after #323

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


**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 Stellar wallet storage
- [ ] Implement Stellar wallet set based on previous component

No files or tests are named. Start by reviewing issue #323 and the prerequisite issues #177 and #178, then inspect the existing wallet-list component referenced in the issue. Done means Stellar wallet storage and a wallet set are implemented and the wallets appear in the GUI.

Written by the indexing model from the issue text.