Adresses #5107

TODO:

• Rename action bar for specific schema navigation component
• Initial implementation of the list connections view
• Implement styles for the list connections view
• Correctly design the action bar for the list view
• Allow deleting a saved connection
• Show only the selected connection in the schema view
• Secondary action bar in the schema view (with details about the selected connection instance)
• Don't show top level connection when exploring schema. Requires instances to always be in the expanded state - Ended up refactoring the cache structure.
• Connection Instances should send onChangeConnections event when their status changes.
• Resume connection modal
• Fix heights for the List component - so it scrolls correctly in the presence of multiple connections.
• Make sure scrolluing works, and that we save scroll state
• %connection_view conn should direct to schema explorer view
• Back icon as SVG
• Arrow right icon as SVG