React hooks for admin CSV pages

[huss]

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

Please see issue #726 for information.

Describe the solution you'd like

The CSV page located in files src/client/app/components/csv/MetersCSVUploadComponent.tsx, src/client/app/components/csv/ReadingsCSVUploadComponent.tsx & src/client/app/containers/csv/UploadCSVContainer.tsx need to be updated for React hooks. The look of the page will stay the same.

Note that each entry item has its own function to deal with changes. The conversions, groups, meters and units pages now have combined functions that can handle input by its type (edit groups sets more complex state). These ideas should be brought into these pages to reduce the number of functions. There is also a way to deal with enum that use a map instead of listing each one that should also be used.

Additional context

None

[huss]

Superseded by issue #1198 so closing.