introduce ability to write status messages on stdout

[ndeloof]

What I did
introduce stdinfo() as output stream to dump status messages about compose progress applying requested operation.
this defaults to POSIX stderr (to easily filter out container output on stdout) but can be switched by setting COMPOSE_STATUS_STDOUT=1

Related issue
closes #7346

(not mandatory) A picture of a cute animal, if possible in relation to what you did

[codecov]

Codecov Report

Patch coverage: 55.88% and project coverage change: -0.07 ⚠️

Comparison is base (0c1a691) 59.81% compared to head (2da4c8a) 59.75%.

Additional details and impacted files

@@            Coverage Diff             @@
##               v2   #10549      +/-   ##
==========================================
- Coverage   59.81%   59.75%   -0.07%     
==========================================
  Files         107      107              
  Lines        9294     9317      +23     
==========================================
+ Hits         5559     5567       +8     
- Misses       3166     3178      +12     
- Partials      569      572       +3     

Impacted Files	Coverage Δ
pkg/compose/kill.go	56.09% <0.00%> (-1.41%)	⬇️
pkg/compose/push.go	0.00% <0.00%> (ø)
pkg/compose/watch.go	24.25% <20.00%> (-0.86%)	⬇️
pkg/compose/compose.go	65.43% <40.00%> (-1.68%)	⬇️
pkg/compose/pause.go	43.47% <50.00%> (ø)
pkg/compose/build.go	76.63% <100.00%> (ø)
pkg/compose/cp.go	60.60% <100.00%> (ø)
pkg/compose/create.go	61.41% <100.00%> (ø)
pkg/compose/down.go	69.12% <100.00%> (ø)
pkg/compose/pull.go	76.72% <100.00%> (ø)
... and 5 more

... and 2 files with indirect coverage changes

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[laurazard]

Nice 🥳 I'm super happy to finally be able to configure this :)