Let the spawned process exit after the output queue is empty

[TaiSakuma]

No description provided.

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (9519625) 85.85% compared to head (7f4488a) 85.89%.

Files	Patch %	Lines
nextline/utils/queue.py	53.84%	5 Missing and 1 partial ⚠️
nextline/plugin/plugins/session/session.py	55.55%	3 Missing and 1 partial ⚠️
nextline/spawned/__init__.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
+ Coverage   85.85%   85.89%   +0.03%     
==========================================
  Files         113      115       +2     
  Lines        4306     4338      +32     
  Branches      710      715       +5     
==========================================
+ Hits         3697     3726      +29     
- Misses        546      548       +2     
- Partials       63       64       +1     

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