Fix primitive entrypoint

[jeff-hernandez]

Using featuretools_primtives as an entry point to load external primitive results in an error because we attempt to iterate over the module.

  File "/Users/jeff.hernandez/Code/featuretools/featuretools/primitives/__init__.py", line 33, in <module>
    for primitive in loaded:
TypeError: 'module' object is not iterable

This fix iterates over the keys in the module to extract primitive objects.

[jeff-hernandez]

If we want to be more specific, we can include which modules contain the conflicting primitives.

[rwedge]

Can we add a test case similar to what we do with the plugin_tests?

I was thinking we'd update the test folder structure like this:

• featuretools/
  • tests/
    • entry_point_tests/
      • plugin_tests/
      • primitive_tests/

[codecov]

Codecov Report

Merging #1891 (26bf433) into main (a8604d5) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1891   +/-   ##
=======================================
  Coverage   98.76%   98.77%           
=======================================
  Files         147      148    +1     
  Lines       16307    16354   +47     
=======================================
+ Hits        16106    16153   +47     
  Misses        201      201           

Impacted Files	Coverage Δ
featuretools/primitives/__init__.py	100.00% <100.00%> (ø)
...eaturetools/tests/entry_point_tests/test_plugin.py	100.00% <100.00%> (ø)
...retools/tests/entry_point_tests/test_primitives.py	100.00% <100.00%> (ø)
featuretools/tests/entry_point_tests/utils.py	100.00% <100.00%> (ø)

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[jeff-hernandez]

@rwedge ready for review

[rwedge]

LGTM