Option to enable/disable "prompt to install `languageserver`"

[mcanouil]

Is your feature request related to a problem? Please describe.
The feature from #965 asks to install "languageserver" when switching projects.
(I am using a lot of projects on remote containers (with R installed) and a shared "home", it is annoying to have to discard the prompt on every projects not really using R and get spammed by the prompt until you do install the package.)

Describe the solution you'd like
In the extension settings, an option to enable (default) / disable #965

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PS: how packages are installed by vscode-R in a renv setup?
EDIT: I found the answer https://github.com/REditorSupport/vscode-R/blob/master/src/util.ts#L511
It uses either base::install.packages or renv::install.packages in a renv project with an .Rprofile (if the R process is spawned properly at project's root).

[mcanouil]

Related to this, maybe a similar check for httpgd?

[mcanouil]

vscode-R/src/languageService.ts

Lines 28 to 32 in dc9b33a

	const installed = await isRPkgIntalled(
	'languageserver', cwd, true,
	'R package {languageserver} is required to enable R language service features such as code completion, function signature, find references, etc. Do you want to install it?',
	'You may need to reopen an R file to start the language service after the package is installed.'
	);

I am assuming this could be replaced by the following:

    const installed = await isRPkgIntalled(
      'languageserver', cwd, config.get<boolean>('promptInstallLanguageServer'),
      'R package {languageserver} is required to enable R language service features such as code completion, function signature, find references, etc. Do you want to install it?',
      'You may need to reopen an R file to start the language service after the package is installed.'
    );

With r.promptInstallLanguageServer, the new boolean setting to add to package.json

[ElianHugh]

Just to add to this, we can make use of the "Don't show again" design pattern

[mcanouil]

Just to add to this, we can make use of the "Don't show again" design pattern

The only downside with this feature is it cannot be reset easily by user (yet) microsoft/vscode#24815

But, the "Don't show again" is probably the "best" way to go https://code.visualstudio.com/api/references/extension-guidelines#notification-examples