The extension does not load on activationEvent ""workspaceContains:**/.go"

This means users loading a workspace containing go files need to open a .go file, or run specific go commands before they can build the workspace.

Steps to Reproduce:

1. close all vscode instances
2. open a workspace that has .go files, ensure that the default state does not focus on a .go code file
3. try to ctrl-shift-p->"Go: Build Workspace"
4. Notice that it fails because the extension is not loaded

Possible solution: Modify package.json to include the workspaceContains event:
"activationEvents": [
"workspaceContains:**/.go",
"onLanguage:go",
"onCommand:go.gopath",
"onCommand:go.tools.install",
"onDebugResolve:go"
],