[Feature] - Store VPN URL and Key and Auto Reconnect - Sc 5754

[IonesioJunior]

Description

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• [ ] I have followed the Contribution Guidelines and Code of Conduct
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[shortcut-integration[bot]]

This pull request has been linked to Shortcut Story #5754: [Feature] - Store VPN URL and Key and Auto Reconnect.

[shortcut-integration[bot]]

This pull request has been linked to Shortcut Story #5882: [Feature] - Refactor Network Pairing to include callback URL.

[madhavajay]

@IonesioJunior awesome work. Lets add a domain reconnection test in this file just like the network reconnection test: https://github.com/OpenMined/PySyft/blob/dev/tests/integration/network/connect_nodes_test.py