chore(provider): add Name() method per provider

internal/provider/vyprvpn/connection.go

@@ -2,7 +2,6 @@ package vyprvpn
 
 import (
 	"github.com/qdm12/gluetun/internal/configuration/settings"
-	"github.com/qdm12/gluetun/internal/constants/providers"
 	"github.com/qdm12/gluetun/internal/models"
 	"github.com/qdm12/gluetun/internal/provider/utils"
 )
@@ -10,6 +9,6 @@ import (
 func (p *Provider) GetConnection(selection settings.ServerSelection) (
 	connection models.Connection, err error) {
 	defaults := utils.NewConnectionDefaults(0, 443, 0) //nolint:gomnd
-	return utils.GetConnection(providers.Vyprvpn,
+	return utils.GetConnection(p.Name(),
 		p.storage, selection, defaults, p.randSource)
 }