Product Preview: Webview Authentication (WP.com hosted sites)

[ealeksandrov]

To access product preview URL we need to authenticate current user in the context of WebView.
The first milestone/scope - WP.com based stores (not self-hosted).

Internal ref: pe5pgL-136-p2#comment-1075

• add loginURL to Site Products Preview: Add loginURL to Site #7943
• migrate CookieJar from WP (no changes) Product Preview: Add WebView authentication tools #7961
• migrate AuthenticationService from WP (no changes) Product Preview: Add WebView authentication tools #7961
• migrate RequestAuthenticator from WP (tweak for WC objects, trim unnecessary flows) Product Preview: Add WebView authentication tools #7961
• migrate WebKitViewController that will use updated RequestAuthenticator (trim it down to minimal UI and functionality) Product Preview: Add WebKitViewController to handle authenticated sessions #7974

[peril-woocommerce]

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