Add zip-store option to model-archiver tool

[mreso]

Description

This PR adds an option to our model-archiver tool to create a mar file without compression. This greatly speeds up the creation of the files which will enable us to reduce unit test time.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Feature/Issue validation/testing

Please describe the Unit or Integration tests that you ran to verify your changes and relevant result summary. Provide instructions so it can be reproduced.
Please also list any relevant details for your test configuration.

• pytest model-archiver/model_archiver/tests/

====================================================================== test session starts =======================================================================
platform linux -- Python 3.9.16, pytest-7.2.2, pluggy-1.0.0
rootdir: /home/ubuntu/serve/model-archiver
plugins: mock-3.10.0, cov-4.0.0
collected 29 items

model-archiver/model_archiver/tests/integ_tests/test_integration_model_archiver.py ...                                                                     [ 10%]
model-archiver/model_archiver/tests/unit_tests/test_model_packaging.py ....                                                                                [ 24%]
model-archiver/model_archiver/tests/unit_tests/test_model_packaging_utils.py .....................                                                         [ 96%]
model-archiver/model_archiver/tests/unit_tests/test_version.py .                                                                                           [100%]

======================================================================= 29 passed in 0.79s =======================================================================

Checklist:

• Did you have fun?
• Have you added tests that prove your fix is effective or that this feature works?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

[codecov]

Codecov Report

Merging #2196 (3e86c28) into master (d0510ba) will increase coverage by 0.25%.
The diff coverage is 100.00%.

❗ Current head 3e86c28 differs from pull request most recent head 88c1665. Consider uploading reports for the commit 88c1665 to get more accurate results

@@            Coverage Diff             @@
##           master    #2196      +/-   ##
==========================================
+ Coverage   71.32%   71.57%   +0.25%     
==========================================
  Files          73       73              
  Lines        3306     3307       +1     
  Branches       57       57              
==========================================
+ Hits         2358     2367       +9     
+ Misses        948      937      -11     
- Partials        0        3       +3     

Impacted Files	Coverage Δ
...l-archiver/model_archiver/model_packaging_utils.py	60.13% <100.00%> (+5.52%)	⬆️

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[agunapal]

@mreso Looks good overall Can you please update this README with the new option and may be showing an example in the Readme? https://github.com/pytorch/serve/blob/master/model-archiver/README.md

[mreso]

@mreso Looks good overall Can you please update this README with the new option and may be showing an example in the Readme? https://github.com/pytorch/serve/blob/master/model-archiver/README.md

Thanks @agunapal I have added the help text but stopped short of an example as use case is primarily testing