[WIP] The draft implementation of the new execution time distributions.

[zhenwendai]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #168 into develop will decrease coverage by 0.85%. The diff coverage is 74.02%.

@@             Coverage Diff             @@
##           develop     #168      +/-   ##
===========================================
- Coverage    88.14%   87.28%   -0.86%     
===========================================
  Files           80       87       +7     
  Lines         4057     4208     +151     
  Branches       691      704      +13     
===========================================
+ Hits          3576     3673      +97     
- Misses         307      358      +51     
- Partials       174      177       +3

Impacted Files	Coverage Δ
mxfusion/components/distributions/random_gen.py	76.11% <0%> (-2.99%)	:arrow_down:
...sion/components/distributions/sigmoid_bernoulli.py	0% <0%> (ø)
mxfusion/components/distributions/bernoulli.py	69.23% <100%> (-22.44%)	:arrow_down:
mxfusion/runtime/distributions/bernoulli.py	100% <100%> (ø)
mxfusion/components/variables/runtime_variable.py	100% <100%> (ø)	:arrow_up:
mxfusion/components/distributions/normal.py	90.59% <100%> (-5.93%)	:arrow_down:
mxfusion/runtime/distributions/__init__.py	100% <100%> (ø)
...xfusion/runtime/distributions/sigmoid_bernoulli.py	50% <50%> (ø)
mxfusion/runtime/distributions/distribution.py	60% <60%> (ø)
...usion/runtime/distributions/multivariate_normal.py	83.33% <83.33%> (ø)
... and 13 more

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