[MAINTENANCE] Rename generic Partitioner union to ColumnPartitioner

[joshua-stauffer]

We have a set of backend-agnostic partitioners in core, which split data on column. Now that we've added another set of partitioners which split data by file name (RegexPartitioner), we need to disambiguate by renaming Partitioner to ColumnPartitioner.

This PR also removes partitioners which we do not support, i.e. partitioners which are not time based.

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[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 81.13%. Comparing base (1610eb9) to head (b92c6b2).
Report is 1 commits behind head on develop.

Files	Patch %	Lines
...pectations/datasource/fluent/invalid_datasource.py	50.00%	1 Missing ⚠️
...xpectations/datasource/fluent/pandas_datasource.py	0.00%	1 Missing ⚠️
...expectations/datasource/fluent/spark_datasource.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9851      +/-   ##
===========================================
- Coverage    81.21%   81.13%   -0.09%     
===========================================
  Files          502      502              
  Lines        44687    44669      -18     
===========================================
- Hits         36293    36241      -52     
- Misses        8394     8428      +34     

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3.8 filesystem	62.25% <63.63%> (-0.02%)	⬇️
3.8 mssql	48.08% <63.63%> (-0.03%)	⬇️
3.8 mysql	48.13% <63.63%> (-0.03%)	⬇️
3.8 postgresql	51.68% <72.72%> (-0.14%)	⬇️
3.8 snowflake	45.96% <63.63%> (-0.03%)	⬇️
3.8 spark	58.03% <63.63%> (-0.02%)	⬇️
3.8 trino	51.11% <63.63%> (-0.02%)	⬇️
3.9	65.77% <63.63%> (+0.08%)	⬆️
cloud	0.00% <0.00%> (ø)
docs-basic	52.16% <63.63%> (-0.04%)	⬇️
docs-creds-needed	53.26% <63.63%> (-0.04%)	⬇️
docs-spark	51.93% <63.63%> (-0.03%)	⬇️

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