web: Improve find space

[joseivanlopez]

Improvements in the dialog to find space:

• Includes the unused space.
• Show devices and slots sorted by position.
• The colums Device and *Details show similar information to the Result table.
• Remove Size details in favor of Shrinkable column.

Code improvements:

• Remove ProposalSpacePolicyField in favor of SpacePolicyDialog component, following the same apprach that the dialogs for boot and device configuration.
• Enable type checking in several components.
• Add more options to TreeTable (expandable rows, expadedItems props).

Screenshots

[coveralls]

coverage: 74.669% (-0.1%) from 74.773%
when pulling 816ae4d on joseivanlopez:find-space-improvements
into 2fb60f8 on openSUSE:master.

[dgdavid]

Great job, thanks! 👍

[dgdavid]

I have been thinking on drop the Proposal prefix from these fields too. In fact, I talked about it with @ancorgs in a call discussing about the PBI I'm working on. However, I believe would be better to move it field to its own file. We can see it in the context of my PBI.