TUN-5262: Allow to configure max fetch size for listing queries

This can be useful/important for accounts with many tunnels that exceed
the 1000 default page size.

There are various tunnel subcommands that use listing underneath, so we make
that flag a tunnel one, rather than adding it to each subcommand.

cmd/cloudflared/tunnel/subcommands.go

@@ -277,6 +277,9 @@ func listCommand(c *cli.Context) error {
 		}
 		filter.ByTunnelID(tunnelID)
 	}
+	if maxFetch := c.Uint("max-fetch-size"); maxFetch > 0 {
+		filter.MaxFetchSize(maxFetch)
+	}
 
 	tunnels, err := sc.list(filter)
 	if err != nil {