added buttons to select all or remove all columns in UI table

[shania-m]

closes: #61

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What

• Introduced buttons to select all columns or hide all columns in Rubicon UI experiment tables

How to Test

• When select all columns button is clicked, all columns appear in the table
• When clear all columns button is clicked, no columns appear in the table

[ryanSoley]

looks like we're right on the edge of the test coverage threshold. the UI stuff is barely tested at all, let's just add the ui directory to the omit section of coverage.py for now. we can revisit the UI tests later

[shania-m]

looks like we're right on the edge of the test coverage threshold. the UI stuff is barely tested at all, let's just add the ui directory to the omit section of coverage.py for now. we can revisit the UI tests later

done @ryanSoley

[ryanSoley]

I think it wants the full path, rubicon_ml/ui. you can run python -m pytest locally to see what the coverage percentage is reporting as and to make sure it picks up the change

[ryanSoley]

the functionality works perfectly! nice job! I do have a nitpick regarding the layout - I'd prefer if the "select all columns" and "clear all columns" were right aligned with the "toggle columns" buttons. so it'd be more like

[Select All] [Clear All]                       [Select All Columns] [Clear All Columns] [Toggle Columns]

if thats not a trivial change, don't spend too much time on it and we can just revisit it later. but I don't think it should be a big change