Add --assume-ready for image and extra-inputs

[bpinsard]

Add --assume-ready option to be passed to run, with extra options for image and extra-inputs.
see #199 .

TODOs

• add basic testing for added option/functionality

[qlty-cloud-legacy]

Code Climate has analyzed commit 380ead9 and detected 0 issues on this pull request.

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[yarikoptic]

just initial peek.

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.07%. Comparing base (db11473) to head (037de79).

Files with missing lines	Patch %	Lines
datalad_container/containers_run.py	85.71%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #205      +/-   ##
==========================================
+ Coverage   93.88%   94.07%   +0.18%     
==========================================
  Files          24       24              
  Lines        1112     1147      +35     
==========================================
+ Hits         1044     1079      +35     
  Misses         68       68              

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[yarikoptic]

Left some minor recommendations but overall I think it should be ok.
But now it would need some basic test added since code with tests is ... broken code ;) See e.g. recently added tests for extra_inputs handling in https://github.com/datalad/datalad-container/blob/HEAD/datalad_container/tests/test_run.py#L195

[yarikoptic]

I will move it to Draft. Please bring it back to "Ready for Review" whenever it gets extended with a test @bpinsard .

[yarikoptic]

ping @bpinsard any time to finish this one up?