Reorganize jmp commands to the 0.6 proposal

[mangelajo]

Details in: https://etherpad.jumpstarter.dev/p/jmp-cli-org-0.6

• jmp
  • version (v)
  • admin (a)
    • version (v)
    • create (c)
      • client (c)
      • exporter (e)
    • delete (d)
      • client(c)
      • exporter(e)
    • get (g)
      • client(c)
      • exporter(e)
      • lease(l)
    • import (i)
      • client(c)
      • exporter(e)
    • install
  • client (c)
    • version (v)
    • shell (s)
    • lease (l)
    • create-config (cc)
    • delete-config (dc)
    • list-configs (lc)
    • use-config (uc)
  • exporter (e)
    • version (v)
    • run (r)
    • shell (s)
    • list-configs (lc)
    • create-config (cc)
    • edit-config (ec)
    • delete-config (dc)