Global Connections

[Neokil]

Is your feature request related to a problem? Please describe.
I really like the tool, but not all databases we have belong to a specific codebase and some belong to multiple codebases. So I have to add Connections for all Projects individually and since I want to save the password I cannot even commit the settings-file to Git.
That makes it very tedious to setup the Connections for every project and every time I did a "git clean" or cloned the repo to a different folder.

Describe the solution you'd like
I would like to have global connections. So when you are creating a Connection it askes if that is a Connection for the current Project (if so save it to ".vscode/settings.json") or if it is a global Connection (if so save it to the global settings).
That way we could setup Connections that are used across projects once and use them everywhere.

[gjsjohnmurray]

Related to #1014