Fix subscribing and publishing logs

[Dragemil]

After all I think subscribing and unsubscribing deserves an information level log.

[github-actions]

Test Results

55 tests   55 ✔️  11s ⏱️
  3 suites    0 💤
  3 files      0 ❌

Results for commit cc26813.

[codecov]

Codecov Report

Merging #40 (cc26813) into main (0b59b28) will not change coverage.
Report is 4 commits behind head on main.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #40   +/-   ##
=======================================
  Coverage   77.67%   77.67%           
=======================================
  Files          30       30           
  Lines         681      681           
  Branches       55       55           
=======================================
  Hits          529      529           
  Misses        131      131           
  Partials       21       21           

Files	Coverage Δ
publisher/src/LeanCode.Pipe/LeanPipePublisher.cs	100.00% <ø> (ø)
...ublisher/src/LeanCode.Pipe/SubscriptionExecutor.cs	47.82% <ø> (ø)

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