integrating-language-servers

Add Language Server Protocol (LSP) support to Visual Studio extensions. Use when the user asks how to integrate a language server, create an LSP client, add language features via LSP, connect a language server to Visual Studio, implement ILanguageClient, create a LanguageServerProvider, add IntelliSense or diagnostics for a custom language via LSP, or wire up a language server executable. Covers VisualStudio.Extensibility (out-of-process), VSIX Community Toolkit (in-process), and legacy VSSDK (in-process) approaches.