Change to REST API

[itan1]

I refactored the MLFLogger to use the REST API from MLFlowClient.jl, see issue #3.

I could keep mostly the same interface with only some minor differences.

[rejuvyesh]

Fantastic. Just one quick thing. The python based mlflow clients usually also handle a lot of cloud authentication stuff (for example logging in azureml is easier if you have azureml-mlflow installed together with mlflow. I'm guessing, we will have to lose on those things if we go the Julia only route until someone implements that part of the API.

[rejuvyesh]

Do you wish to take a shot at enabling the server at MLFLOW_URI in the github workflow to allow running the tests. We probably just need to install and run mlflow serve and set the environment variable.

[itan1]

I indeed don't see anything azure specific in MLFlowClient.jl at the moment. Could we make a separate issue for that functionality?

Using the MLFlow basic authentication should be possible via the headers argument like described in this MLFlowClient Issue. The MLFLogger constructor should pass the argument to the MLFlow constructor.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 78.68%. Comparing base (f59c3b6) to head (80d8609).

Files	Patch %	Lines
src/MLFlowLogger.jl	80.00%	6 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           master       #5       +/-   ##
===========================================
+ Coverage    3.19%   78.68%   +75.49%     
===========================================
  Files           3        1        -2     
  Lines          94       61       -33     
===========================================
+ Hits            3       48       +45     
+ Misses         91       13       -78     

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