Add entry points

[gsheni]

• Added an entrypoint for featuretools primitives

[codecov]

Codecov Report

Merging #452 into master will decrease coverage by 0.25%.
The diff coverage is 39.47%.

@@            Coverage Diff             @@
##           master     #452      +/-   ##
==========================================
- Coverage   96.49%   96.24%   -0.26%     
==========================================
  Files         102      102              
  Lines        8693     8724      +31     
==========================================
+ Hits         8388     8396       +8     
- Misses        305      328      +23

Impacted Files	Coverage Δ
featuretools/synthesis/__init__.py	100% <100%> (ø)	⬆️
...s/tests/primitive_tests/test_install_primitives.py	98.94% <100%> (ø)	⬆️
featuretools/primitives/__init__.py	30% <22.22%> (-70%)	⬇️
featuretools/synthesis/dfs.py	73.91% <25%> (-26.09%)	⬇️
featuretools/__init__.py	66.66% <33.33%> (-33.34%)	⬇️

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