Add a Language Server extension to get the project main sources (glsMains request).
Add a Language Server extension to get the project main executables (glsExecutables request).
Activate the extension when Gpr or Ada sources are present in the current directory or sub-directory (only 1 level lookup).
Add tests to the VS Code extension test-suite, testing the alsCheckSyntax, glsMains and glsExecutables requests.
In order to not raise an exception when VS Code sends it.
We don't handle it for now since VS Code already outputs a lot
of useful information (resquests being sent, results...) when
the trace setting is set to 'messages' or 'verbose'.
This could be used in the future if we want to have more debug
traces in the ALS.
closes eng/ide/ada_language_server#1116
Allowing the extension to query them in order to add them to the workspace
if not already present.
This allows to search for files that come from imported projects that might
not be under the workspace root directory.
This works only for importing non-externally built source directories
for the moment.
Use the newly added completionItem/resolve request to compute
the 'documentation' and 'detail' fieds of completion items lazily
when the client supports it (i.e: when a given item gets selected
in the completion window).
This makes the ALS way faster to return completion items for packages
that contain a huge number of declarations (e.g: Libadalang.Common).
VS Code already supports this lazy computation method but not other
clients.
