Added overrides that fix bug with camera access

[BraydenLangley]

Problem

• iOS WKWebView camera would open in fullscreen native view when websites called getUserMedia()
• Camera view would get stuck and not dismiss properly, leaving a black screen
• No existing mechanism to prevent or properly clean up WKWebView camera access

Solution

• Layer 1: JavaScript Polyfill (Injected Script)
• Laye2: WebView Permission Blocking
• Added our own react Camera Request Handler

[jackielu3]

Just a heads up but I'll be adding a lot more to the webview injection for my changes! I may move the entire thing into it's own separate file