Networking and Bootstrapping configuration changes

[jmwample]

NYM-927

This PR moves toward distilling and synchronizing the specific networking information that is needed to bootstrap connections such that the structure can be shares and re-used in both nym core applications and in VPN / discovery use cases.

This change:

• Updates the NetworkDetails structure
  • removing the nym_vpn_api_url field (this was deprecated by the addition of nym_vpn_api_urls)
  • moves nym_vpn_api_urls and nym_api_urls into a new NetworkingSpecifics structure
  • Adds placeholder fields for internal DNS resolver and covert channel information in the networking specifics.
  • Adds mainnet defaults for the updated NetworkDetails and new NetworkingSpecifics
• moves sandbox information from the nym-wallet-types to the nym-network-details crate to match the mainnet network details.
• update setter and getter functions

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Project	Deployment	Actions	Updated (UTC)
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