Add toolchain version picker (#1674)

Author: roulpriya

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Added
 
+- Add clickable toolchain selection to Swift version status bar item ([#1674](https://github.com/swiftlang/vscode-swift/pull/1674))
 - Add macOS support for Swiftly toolchain management ([#1673](https://github.com/swiftlang/vscode-swift/pull/1673))
 - Show revision hash or local/editing keyword in project panel dependency descriptions ([#1667](https://github.com/swiftlang/vscode-swift/pull/1667))
 

src/ui/LanguageStatusItems.ts

@@ -16,6 +16,7 @@ import * as vscode from "vscode";
 import { Command } from "vscode-languageclient";
 import { WorkspaceContext, FolderOperation } from "../WorkspaceContext";
 import { LanguagerClientDocumentSelectors } from "../sourcekit-lsp/LanguageClientConfiguration";
+import { Commands } from "../commands";
 
 export class LanguageStatusItems implements vscode.Disposable {
     constructor(workspaceContext: WorkspaceContext) {
@@ -31,6 +32,8 @@ export class LanguageStatusItems implements vscode.Disposable {
             label: `Swift Version ${toolchain.swiftVersion.toString()}`,
         };
 
+        swiftVersionItem.command = Command.create("Select Toolchain", Commands.SELECT_TOOLCHAIN);
+
         // Package.swift item
         const packageSwiftItem = vscode.languages.createLanguageStatusItem("swiftlang-package", [
             ...LanguagerClientDocumentSelectors.appleLangDocumentSelector,