follow Redux styles suggestions

[huss]

Is your feature request related to a problem? Please describe.

Redux has a number of recommended styles including:

• https://redux.js.org/style-guide/#structure-files-as-feature-folders-with-single-file-logic for colocating slice with feature
• Use selectItem for selector names per https://redux.js.org/style-guide/#name-selector-functions-as-selectthing

It is unclear that OED is doing these or doing them consistently.

Describe the solution you'd like

With the transition to Redux Toolkit, OED will follow their recommendations for style. This makes it easier for a developer to map from Redux help/tutorials/documentation to OED's code base. It also should be easier for anyone familiar with standard Redux style.

Describe alternatives you've considered

What OED has will work but continue to have added overhead for developers.

Additional context

None

[huss]

I think this should wait until OED completely most/all of the Redux Toolkit conversion. This should mean few new files are being created/changed during the process.