Example for using query params with Angular reactive forms

Fork of the angular reactive-form example code. Shows an example how to store data from a reactive form as query params.

Can be used per example for search forms, to allow a user to share it's url, or simply to retrieve his search param after routing to another page.

Enhancements

• ❌ Add type information (which convention should be used?)
  • [bool]true,[date]2023-0719
  • [b|d]val
  • other ?
• ❌ Add nested formGroups to test this part
• ❌ Unsubscribe of observables ? Simple way could be to create observable on angular lifecycle "on destroy"
• ❌ Tests
  • ✅ utils functions
  • ✅ abstract control observable piping
  • ❌ FormQueryParamService testing with mocking router route.