Develop/print config type

[victorywys]

In order to reconstruct an instance solely from logs, one need to know the type of a config class besides its parameters. In this commit, a config_type.json will be generated containing such information.

[codecov-commenter]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (c7bf170) 67.56% compared to head (78888a5) 72.42%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   67.56%   72.42%   +4.85%     
==========================================
  Files          33       33              
  Lines        1927     1962      +35     
==========================================
+ Hits         1302     1421     +119     
+ Misses        625      541      -84     

Files	Coverage Δ
utilsd/fileio/config.py	89.55% <100.00%> (ø)
utilsd/experiment.py	73.33% <82.05%> (+49.85%)	:arrow_up:

... and 2 files with indirect coverage changes

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