allow "| grep" for all grcli commands

[christophefontaine]

Description

With many routes or addresses / whatever, the output of grcli may be high.
We already have the option in stats software pattern <re>, but it would be great to expand that to any command in grcli.
And to provide a better "look and feel" to the user, | grep would be a great addition !

Context and Use Cases

[root@droplet05 core]# podman exec -ti grout-boot grcli route show | grep af=IPv6
0    fc00:1::/64        type=L3 iface=fabric vrf=0 origin=INTERNAL af=IPv6 addr=fc00:1::55/64 mac=7a:81:dc:d4:2f:f6 static local link
0    fe80:101::/64      type=L3 iface=eno49v1 vrf=0 origin=INTERNAL af=IPv6 addr=fe80::7a81:dcff:fed4:2ff6/64 mac=7a:81:dc:d4:2f:f6 static local link
0    fe80:102::/64      type=L3 iface=eno50v0 vrf=0 origin=INTERNAL af=IPv6 addr=fe80::e6f:90ff:feb1:7d01/64 mac=0e:6f:90:b1:7d:01 static local link
0    fe80:103::/64      type=L3 iface=fabric vrf=0 origin=INTERNAL af=IPv6 addr=fe80::7a81:dcff:fed4:2ff6/64 mac=7a:81:dc:d4:2f:f6 static local link
1    fe80:104::/64      type=L3 iface=ocp vrf=1 origin=INTERNAL af=IPv6 addr=fe80::7a81:dcff:fed4:2ff6/64 mac=7a:81:dc:d4:2f:f6 static local link