Feature request: Filter NordVPN servers by group

[qdm12]

What's the feature 🧐

NordVPN servers have groups, it would be nice to be able to filter by group.

• Change internal/providers/nordvpn/updater code
• Update internal/storage/servers.json
• Update Github wiki NorVPN servers list

Blocked by #1380

Extra information and references

Requested in:

• Feature request: Pick the recommended NordVPN server to connect to. #719 (comment)
• Wiki issue: Update NordVPN to include support for SERVER_GROUPS #1541

[vdrover]

following.

[github-actions]

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