migrate ComparisonProperties

[ThomasHepworth]

Preface

I've been having a quick play around with the Comparison levels and seeing if there's anything we can quickly do to clean up the workflow. At the moment it's rather convoluted and difficult to follow.

The problem is, the inheritance structure we currently have doesn't allow much flexibility for moving everything about. It's also quite clear once you get to the individual dialect stage.

The proposed chart diagrams should really help here and I think it's worthwhile getting those right.

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Changes

Anyway... this PR simply shifts the location of the ComparisonProperties class.

I'd propose we do this for two reasons:

1. We no longer import _level comparisons when importing the _comparison_library.py files
2. It feels a more natural fit for the class. You create the subclasses within that folder and then bind them onto the ComparisonProperties class.

If you disagree or have a differing view, feel free to shout. I can close this PR and we can have a chat.

[github-actions]

Test: test_2_rounds_1k_duckdb

Percentage change: -29.5%

	date	time	stats_mean	stats_min	commit_info_branch	commit_info_id	machine_info_cpu_brand_raw	machine_info_cpu_hz_actual_friendly	commit_hash
849	2022-07-12	18:40:05	1.89098	1.87463	splink3	c334bb9	Intel(R) Xeon(R) Platinum 8370C CPU @ 2.80GHz	2.7934 GHz	c334bb9
1581	2023-04-24	11:08:49	1.34152	1.32128	(detached head)	8ce2201	Intel(R) Xeon(R) Platinum 8272CL CPU @ 2.60GHz	2.5939 GHz	8ce2201

Test: test_2_rounds_1k_sqlite

Percentage change: -24.1%

	date	time	stats_mean	stats_min	commit_info_branch	commit_info_id	machine_info_cpu_brand_raw	machine_info_cpu_hz_actual_friendly	commit_hash
851	2022-07-12	18:40:05	4.32179	4.25898	splink3	c334bb9	Intel(R) Xeon(R) Platinum 8370C CPU @ 2.80GHz	2.7934 GHz	c334bb9
1583	2023-04-24	11:08:49	3.23515	3.23138	(detached head)	8ce2201	Intel(R) Xeon(R) Platinum 8272CL CPU @ 2.60GHz	2.5939 GHz	8ce2201

Click here for vega lite time series charts

[ADBond]

Yep I think this makes sense, seems like a sensible change - certainly the cleaner imports suggest this is a more sensible structure.