Add setting for disabling auto-imports

[pontusgranstrom]

I propose adding a setting for turning off the feature that looks up symbols across the files in a project and automatically imports them unqualified.

Expected Behavior

A setting in the server, and in any plugins, for enabling/disabling auto-imports.

Current Behavior

There are no settings for auto-imports.

Context

When there are multiple Elm files containing similar symbols, auto-imports happen accidentally (at least in visual studio code). This can hurt more than it helps, and has resulted in

• me checking in import lines unintentionally
• errors when unqualified imports clash

I like to be intentional about my imports, so if there was a setting for turning auto-imports off, I would use it.

The auto-imports would be more helpful to me

• if triggered with confirmation rather than on auto-complete, but that might be outside the control of a plugin/extension.
• if they imported symbols qualified (I am under the impression that this is considered good Elm style).