Inserter menu: Assure a minimum blocks list height

[fluiddot]

Description

Related to adding the reusable blocks list to the inserter menu, I added segmented control for having tab navigation and I realised that the blocks list size is reduced by the rest of elements.

Step-by-step reproduction instructions

1. Add an empty View with a specific height (something like: <View style={ { backgroundColor: 'red', height: 120 } } />) to the inserter menu.
2. Open the inserter menu
3. Observe that the blocks list is too small

Expected behaviour

The blocks list should have a minimum height.

Actual behaviour

The blocks list can be too small if the rest of content pushes it.

Screenshots or screen recording (optional)

WordPress information

• WordPress version: N/A
• Gutenberg version: N/A
• Are all plugins except Gutenberg deactivated? N/A
• Are you using a default theme (e.g. Twenty Twenty-One)? N/A

Device information

• Device: iPhone 8 (simulator)
• Operating system: iOS 14.2
• WordPress app version: 17.0

[fluiddot]

One option I'm evaluating is to add a header prop to the BottomSheet component, this way we could render the extra elements (like the search input) as the header and let the content (the blocks list) to grow and fit all the height.

cc @jhnstn