OpenAPI Python Client

[nopcoder]

Part of #1725
Changes made to the project Makefile to generate the python client code.
Added:

• clients/python/lakefs/client.py to enable a single client with access to all APIs
• clients/python/build-package.sh to build pypi package

[codecov-io]

Codecov Report

Merging #1725 (ae9f62d) into master (e4554b9) will decrease coverage by 0.14%.
The diff coverage is n/a.

❗ Current head ae9f62d differs from pull request most recent head 2a8db58. Consider uploading reports for the commit 2a8db58 to get more accurate results

@@            Coverage Diff             @@
##           master    #1725      +/-   ##
==========================================
- Coverage   41.60%   41.46%   -0.15%     
==========================================
  Files         168      170       +2     
  Lines       13319    13422     +103     
==========================================
+ Hits         5542     5565      +23     
- Misses       7035     7114      +79     
- Partials      742      743       +1     

Impacted Files	Coverage Δ
pkg/metastore/hive/ms_client.go	30.43% <0.00%> (-2.90%)	⬇️
pkg/api/helpers/errors.go	81.81% <0.00%> (ø)
pkg/api/helpers/upload.go	0.00% <0.00%> (ø)
pkg/pyramid/tier_fs.go	58.51% <0.00%> (+1.74%)	⬆️

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[itaiad200]

Great work!