Fix: Podman cli status & memory

[sdargoeuves]

Fix netlab status --memory for Podman runtime

When using defaults.providers.clab.runtime: podman, the netlab status and
netlab status --memory commands showed no container status or memory usage.

Root cause

Podman's Docker-compatible CLI returns JSON differently from Docker:

	Docker	Podman
docker ps --format json	one JSON object per line	JSON array
Names field	string	list of strings
docker stats --format json	one JSON object per line	JSON array
field names	Name, MemUsage	name, mem_usage
memory units	binary (KiB, MiB, GiB)	decimal (kB, MB, GB)

Changes

providers/clab/__init__.py

• get_lab_status: if docker ps output is a JSON array (Podman), normalize it
  to Docker's per-line format and unwrap Names from list to string before
  running the existing parsing logic unchanged.
• add_memory_usage: same normalization for docker stats — map Podman's
  name/mem_usage fields to Docker's Name/MemUsage, then parse and
  re-format the value in binary units (MiB/GiB) so the memory column is
  consistent across Docker, Podman, and libvirt VMs.

utils/strings.py

• MEMORY_UNITS: added decimal SI units (KB, MB, GB, TB) alongside
  the existing binary ones, with correct byte-to-KiB conversion factors.
• parse_memory_size: extended the regex to also match decimal unit suffixes
  ([KMGT]B).

[ipspace]

Looks good to me, and still works with Docker ;) Thank you!