Adding connection state to database side panel

[daveajrussell]

This PR introduces connection state to the database side panel.

At the moment, the side panel is fairly basic and will simply show a state for connected, even if under the hood the connection has failed.

In this change, the side panel becomes much smarter and hooks into newly emitting events from the underlying driver/database connection. The side panel will update itself when a database connection drops, when it reconnects and when it gives up trying to connect to the database.

Also introduced is instant connection status feedback when adding/editing/connecting to/toggling a Connection.. whether this is bad auth, a non existent database or an unreachable server.

In the side panel, when you connect to a connection you are first presented with a "Connecting" state.. the label next to the connection will briefly read connecting... until the connection promise resolves, at which point we switch the label to connected and show a success info message.

For connections that error (and are retriable), we will show a reconnecting... label and an accompanying warning message.

For connections that fail, we will remove the connecting state entirely and display an error message.

[changeset-bot[bot]]

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Latest commit: 9d658331fa25921e73b0629dfdff8f56cc817681

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[daveajrussell]

[VSCode Extension] Synchronicity between DBMS connection and extension