Feature Request - Add Zoom Support for WinForms version

[chaau]

The WPF Version of the ChromiumWebBrowser supports zoom controls (https://github.com/cefsharp/CefSharp/blob/master/CefSharp.Wpf/ChromiumWebBrowser.cs#L2635-L2663)

Can we also add the support for Zoom to the WinForms Version (https://github.com/cefsharp/CefSharp/blob/master/CefSharp.WinForms/ChromiumWebBrowser.cs)?

Checklist:

• I have reviewed the CEF API and have confirmed the feature I'm requesting is possible.
• The Feature I'm requesting is an improvement to Async Javascript Binding (No new feature are being added to the Sync Javascript binding)
• An open PR exists on the CEF Pull Requests and I'd like to propose this feature is added to CefSharp when/if it's merged.