Prevent auto-focus on stripe extension when activated

[Anemy]

When the extension is activated, and the CLI is not installed, the extension is automatically focused in the sidebar. This is disruptive to folks, every time I restart vscode and open a js or typescipt file this happens, which brings me out of the file explorer.

The quickest fix for this issue would be to disable the auto focus.

vscode-stripe/src/stripeClient.ts

Line 33 in a6d71b2

vscode.commands.executeCommand('stripeInstallCLIView.focus');

Ideally the CLI would be bundled with the extension, so this wouldn't happen, or automatically installed/updated through any intentional stripe extension action (not just activation). #158

This may go away as a result of a fix from #187 or #158