Relates to #791

Mods for item 2 above have been pushed to branch persist-folder-view-1395.

Changes

• TLDR: the view switcher now locally stores and restores the last selected view for a given object type. This makes a folder's List View actually usable as the view persists as you navigate folders, rather than completely useless as in the current behavior of constantly reverting to the grid view.
• Interacting with the view switcher in any view that uses it now stores that selection as a "view preference" for that object type in a localstorage object named 'openmct-stored-view-prefs'.
• Browse.js > #navigateToPath now retrieves the stored view preference when its currentViewKey argument is undefined. This allows bookmarked views or links that include a view searchparam to force a particular view when desired. Navving to a link in this way doesn't update the stored preference; that only occurs when the view switcher is actively changed by the user.

Testing Notes

1. Navigate to a folder and verify it displays by default with the "grid" view.
2. Use the view switcher to select "List View". Verify that the view changes to the selected view, and that the label in the switcher displays "List View".
3. Nav away to another view not a folder, then back to the initial folder or any other folder.
4. Verify that the view is still the List View and didn't revert to the Grid View.
5. Refresh the page, verify that the view remains as it was in step 6.
6. Use the view switcher to select "Grid View". Verify that the view changes as expected.
7. Repeat step 3 above.
8. Verify that the view remains as Grid View.
9. Manually edit the browser's URL querystring view parameter to change it from 'grid' to 'list-view', then press Enter to go to that URL. Verify that the view loads in the List View.
10. Repeat step 3 above.
11. Verify that the folder view is back to the last selected view which is Grid.

Repeat this test with other object types that have multiple views, like telemetry and Condition Sets.

@mudinthewater Can you have a look at the changes above and let me know if you'd have any issues with this behavior?

I think it should be fine!