Display BGP gateway mode in show protocol output

[Sébastien PARISOT]

Hello BIRD team!

This simple patch (for branch master) adds a field for the BGP channel gateway mode (direct or recursive) setting in show protocol output. It is is a useful information to have in some troubleshooting scenario.

Example:

bird> show protocol all bgp_test
Name             Proto      Table                        State  Since                Info
bgp_test           BGP        ---                          up     2025-08-12 15:11:54  Established   
  BGP state:          Established
[...]
  Channel ipv6
    State:          UP
[...]
    Gateway: recursive
[...]

Thanks!
--
Sébastien
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