add mysocketctl container with examples on how to expose services of containerlab with it

[hellt]

ref https://twitter.com/ntdvps/status/1347972477759217667

idea is to prepare a mysocketctl container which will be used to spawn multiple mysocketctl clients inside per each shared port.
potentially skipping the login step, since cloud auth is possible https://twitter.com/atoonk/status/1347977674287841280

use go client instead of python one

Stage 1

first integration stage assumes that users manually connect to mysocketctl container and create multiple tunnels per each port needed exposure

Stage 2

the services on nodes that needs to be shared are configured like that

nodes:
  node1:
    share:
      - 80
      - 443

  mysocketio:
    image: mysocketctl

this should automatically invoke tunnel creation on mysocketio node targeting ports 80 and 443 on node1.
The exposed ports should be available in the log as well as on mysocket container

[hellt]

stage 1 skipped, delivering stage2 in #261