Suggest LSP-* helpers based on programming language

[LDAP]

trafficstars

Is your feature request related to a problem? Please describe. Some language server names (and thus their helper plugin) do not correspond to the language they support. (E.g. clangd, jdtls).

Describe the solution you'd like

• A new command Install Language Server that lists all options (or just one recommended one) for that language and installs the helper plugin.
• A one-time popup that is triggered when a language is opened for the first time and that asks the user if the recommended helper plugin for the current language should be installed.

Describe alternatives you've considered none

Additional context This should help new users to get up and running more quickly.