Enable full solution background analysis

- Adds 2 new background analysis scope options: one for compiler diagnostics and one for analyzer diagnostics
- Both the options allow the same set of values as in VS: Open documents, Entire solution, Current document and None (disabled). Currently, `Current document` option is not yet supported in LSP as we do not have a way to know which is the current active document in LSP server.
- Builds on top of dotnet/roslyn#68799
- Needs couple more Roslyn side changes as a follow-up: dotnet/roslyn#68797 and dotnet/roslyn#68798

Author: mavasani

package.json

@@ -1274,6 +1274,42 @@
             "description": "Show regular expressions in completion list.",
             "order": 20
           },
+          "dotnet.backgroundAnalysis.solutionCrawlerBackgroundAnalysisScope": {
+            "type": "string",
+            "enum": [
+              "activeFile",
+              "openFiles",
+              "fullSolution",
+              "none"
+            ],
+            "default": "openFiles",
+            "enumDescriptions": [
+              "Current document (not yet supported)",
+              "Open documents",
+              "Entire solution",
+              "None"
+            ],
+            "description": "Run background code analysis for:",
+            "order": 30
+          },
+          "dotnet.backgroundAnalysis.compilerDiagnosticsScope": {
+            "type": "string",
+            "enum": [
+              "activeFile",
+              "openFiles",
+              "fullSolution",
+              "none"
+            ],
+            "default": "openFiles",
+            "enumDescriptions": [
+              "Current document (not yet supported)",
+              "Open documents",
+              "Entire solution",
+              "None"
+            ],
+            "description": "Show compiler errors and warnings for:",
+            "order": 30
+          },
           "dotnet.highlighting.highlightRelatedRegexComponents": {
             "type": "boolean",
             "default": "true",

test/unitTests/lspToolHost/configurationMiddleware.test.ts

@@ -45,6 +45,8 @@ const testData = [
     { serverOption: "csharp|code_style.formatting.indentation_and_spacing.indent_style", vsCodeConfiguration: "codeStyle.formatting.indentationAndSpacing.indentStyle", declareInPackageJson: false},
     { serverOption: "csharp|code_style.formatting.new_line.end_of_line", vsCodeConfiguration: "codeStyle.formatting.newLine.endOfLine", declareInPackageJson: false},
     { serverOption: "code_style.formatting.new_line.insert_final_newline", vsCodeConfiguration: "codeStyle.formatting.newLine.insertFinalNewline", declareInPackageJson: false},
+    { serverOption: "mystery_language|background_analysis.dotnet_solution_crawler_background_analysis_scope", vsCodeConfiguration: "dotnet.backgroundAnalysis.solutionCrawlerBackgroundAnalysisScope", declareInPackageJson: true},
+    { serverOption: "mystery_language|background_analysis.dotnet_compiler_diagnostics_scope", vsCodeConfiguration: "dotnet.backgroundAnalysis.compilerDiagnosticsScope", declareInPackageJson: true},
 ];
 
 suite("Server option name to vscode configuration name test", () => {