refactor preferences reducers and actions using redux toolkit

[PiyushChandra17]

Associated Issue: #2042

Changes:

• Deleted all the corresponding constants
• Used createSlice to rewrite preferences reducers
• Exported all the action creator functions

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123

[lindapaiste]

I wrote a lot on your other PRs so I'll keep this quick. I absolutely hate this actions file and I would love to see us take it a few steps further. I can set up a middleware that calls the preferences API whenever the state.preferences changes and then we don't need to define a separate thunk for every single action. We would be able to just dispatch the auto-generated actions directly.

[PiyushChandra17]

I wrote a lot on your other PRs so I'll keep this quick. I absolutely hate this actions file and I would love to see us take it a few steps further. I can set up a middleware that calls the preferences API whenever the state.preferences changes and then we don't need to define a separate thunk for every single action. We would be able to just dispatch the auto-generated actions directly.

@lindapaiste This was my first thought aswell regarding the action file. We can directly dispatch these actions from the slices