WIP: python brain impl

[samplise]

What changes were proposed in this pull request?

Add brain python implementation.

Why are the changes needed?

A python brain is easier to use.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Unit test.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 52 lines in your changes missing coverage. Please review.
✅ Project coverage is 15.11%. Comparing base (235cee6) to head (11da234).
⚠️ Report is 14 commits behind head on elastic_sync_training.

Files with missing lines	Patch %	Lines
dlrover/python/brain/client.py	0.00%	52 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (15.11%) is below the target coverage (81.00%). You can increase the head coverage or adjust the target coverage.
❌ Your project check has failed because you have indirect coverage changes. Learn more about Unexpected Coverage Changes and reasons for indirect coverage changes.

❗ There is a different number of reports uploaded between BASE (235cee6) and HEAD (11da234). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (235cee6)	HEAD (11da234)
	4	1

Additional details and impacted files

@@                    Coverage Diff                     @@
##           elastic_sync_training    #1668       +/-   ##
==========================================================
- Coverage                  80.27%   15.11%   -65.17%     
==========================================================
  Files                        225      225               
  Lines                      22150    22309      +159     
==========================================================
- Hits                       17780     3371    -14409     
- Misses                      4370    18938    +14568     

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