Feature/persist filter states

[dukeofharen]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Currently, when you fill in a filter on the stubs or requests page in the UI, the search results are not persisted when you navigate to another page.

Issue Number: N/A

What is the new behavior?

• When filling in the filter on the stubs or requests pages, the filter will be persisted and when you navigate back to any of the pages, the filter will still be filled in.
• This functionality can be turned on or off.
  
• I also made it possible to search on the requests screen using the request correlation ID (small oversight from the past).

Does this introduce a breaking change?

• Yes
• No

Yes, but only a very small one. Because the settings are saved a bit differently, you need to enable the dark theme once again.

Other information