Rename DateTimeFeaturization to DateTimeFeaturizer

[dsherry]

After discussion we named the text featurizer TextFeaturizer because we liked that convention more than TextFeaturization. Doing the same here: DateTimeFeaturization --> DateTimeFeaturizer

[angela97lin]

Once all tests pass, LGTM! 👍

[freddyaboulton]

@dsherry I think this is good to merge when all the tests pass!

[jeremyliweishih]

LGTM once tests pass

[codecov]

Codecov Report

Merging #977 into main will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #977   +/-   ##
=======================================
  Coverage   99.87%   99.87%           
=======================================
  Files         174      174           
  Lines        8990     8990           
=======================================
  Hits         8979     8979           
  Misses         11       11           

Impacted Files	Coverage Δ
evalml/pipelines/components/__init__.py	100.00% <ø> (ø)
...alml/pipelines/components/transformers/__init__.py	100.00% <100.00%> (ø)
.../components/transformers/preprocessing/__init__.py	100.00% <100.00%> (ø)
.../transformers/preprocessing/datetime_featurizer.py	100.00% <100.00%> (ø)
evalml/pipelines/utils.py	100.00% <100.00%> (ø)
.../tests/component_tests/test_datetime_featurizer.py	100.00% <100.00%> (ø)
...alml/tests/component_tests/test_text_featurizer.py	100.00% <100.00%> (ø)
evalml/tests/pipeline_tests/test_pipelines.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update eedd427...838d54b. Read the comment docs.