New Step Design

[htahir1]

Pre-requisites

Please ensure you have done the following:

• I have read the CONTRIBUTING.md document.
• If my change requires a change to the documentation, I have updated the documentation accordingly.
• I have added tests to cover my changes.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Describe changes

This completely changes the API for step creation with materializers.

[codecov]

Codecov Report

Merging #128 (a9f1ad6) into main (57d04d4) will decrease coverage by 2.16%.
The diff coverage is 39.33%.

@@            Coverage Diff             @@
##             main     #128      +/-   ##
==========================================
- Coverage   51.80%   49.63%   -2.17%     
==========================================
  Files          65       74       +9     
  Lines        1936     2212     +276     
==========================================
+ Hits         1003     1098      +95     
- Misses        933     1114     +181     

Impacted Files	Coverage Δ
src/zenml/cli/config.py	0.00% <0.00%> (ø)
src/zenml/materializers/tf_dataset_materializer.py	0.00% <0.00%> (ø)
...enml/orchestrators/airflow/airflow_orchestrator.py	47.82% <ø> (ø)
src/zenml/stacks/base_stack.py	75.00% <0.00%> (ø)
src/zenml/types/base_type.py	0.00% <0.00%> (ø)
src/zenml/types/pytorch_types.py	0.00% <0.00%> (ø)
src/zenml/materializers/keras_meterializer.py	16.66% <16.66%> (+5.55%)	⬆️
...rc/zenml/orchestrators/local/local_orchestrator.py	50.00% <16.66%> (+2.38%)	⬆️
src/zenml/metadata/base_metadata_store.py	35.48% <16.90%> (-12.80%)	⬇️
src/zenml/materializers/pytorch_materializer.py	21.42% <21.42%> (ø)
... and 29 more

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