Search manager for each flow

[erikbasargin]

Describe the solution you'd like

For each page should work one search manager. For now, the NavigationView for iPad has double column mode. This makes problems to change states between global NavigationBar. If we added sub-Navigation View for each flow we would catch a few problems:

• content of sub-navview ignores the top inset
• transition animation is broken (error: Unbalanced calls to begin/end appearance transitions)

Describe alternatives you've considered

• Replace the global iPad NavigationView to a custom SplitView (it's for the 👆solution)
• Navbar manager should control states of a Navigation bar for each main flow which presents in the MainBar.
  Additionally, need to make the main search manager that controls states of the search for each main flow.

Additional context

Add any other context or screenshots about the feature request here.