Add an option to configure a timeout for plugins

[gerritholl]

Allow users to configure a timeout for each plugin/worker that is run. If defined, this indicates the number in seconds trollflow2 will wait for the job to complete.

• [x] Closes #100
• [x] Tests added
• [x] Tests passed
• [x] Passes flake8 trollflow2
• [x] Fully documented
• [x] Add your name to AUTHORS.md if not there already

[codecov[bot]]

Codecov Report

Merging #104 (c7c655b) into master (34b704c) will increase coverage by 0.02%. The diff coverage is 95.45%.

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
+ Coverage   93.20%   93.23%   +0.02%     
==========================================
  Files           9        9              
  Lines        1737     1759      +22     
==========================================
+ Hits         1619     1640      +21     
- Misses        118      119       +1     

Flag	Coverage Δ
unittests	93.23% <95.45%> (+0.02%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
trollflow2/launcher.py	76.59% <87.50%> (+0.38%)	:arrow_up:
trollflow2/tests/test_launcher.py	98.55% <100.00%> (+0.10%)	:arrow_up:

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[gerritholl]

The test failure for (3.9, ubuntu-latest, true) (whatever true means here) does not appear related to this PR.

[ghost]

Congratulations :tada:. DeepCode analyzed your code in 0.741 seconds and we found no issues. Enjoy a moment of no bugs :sunny:.

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[gerritholl]

Retry DeepCode

[gerritholl]

The CodeFactor failure is in a part of the code I did not touch. I don't know why the (3.9, ubuntu-latest, true) test fails, but it doesn't appear to be in code I touched either.

[gerritholl]

The unstable test is failing if satpy is but pyresample isn't installed. Is that really a situation we need to cover?

[gerritholl]

This test will pass if https://github.com/pytroll/trollflow2/pull/110 is merged first.

[mraspaud]

For some reason the tests of macos with python 3.7 are failing now...

[adybbroe]

LGTM. Thanks @gerritholl I would not bother about the CodeFactor issue for this PR!