pimd: Show group-type under `show ip pim rp-info`

pimd: Show group-type under `show ip pim rp-info`

And filter by group for PIM.

```
exit1-debian-11# show ip pim rp-info
RP address       group/prefix-list   OIF               I am RP    Source   Group-Type
192.168.10.17    238.0.0.0/24        eth2              no         Static   ASM
192.168.10.110   232.0.0.0/24        eth2              no         Static   SSM
exit1-debian-11# show ip pim rp-info 238.0.0.0/24
RP address       group/prefix-list   OIF               I am RP    Source   Group-Type
192.168.10.17    238.0.0.0/24        eth2              no         Static   ASM
exit1-debian-11# show ip pim rp-info 238.0.0.0/24 json
{
  "192.168.10.17":[
    {
      "rpAddress":"192.168.10.17",
      "outboundInterface":"eth2",
      "iAmRP":false,
      "group":"238.0.0.0/24",
      "source":"Static",
      "groupType":"ASM"
    }
  ]
}
exit1-debian-11#
```

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>