Fix bug where invalid links in a PDF crash the SDK

[sujaygarlanka]

Goals ⚽

• Fix a bug where invalid links in a PDF are crashing the app when clicked
• Open links with schemes other than http and https like mailto, tel, sms, etc. in the appropriate apps

Implementation Details 🚧

• Only links with http or https schemes can be opened by the browser. We check if the URL has one of these schemes, then we open it if it does. This prevents the browser from opening an invalid link and crashing the app.
• If a link has another scheme like mailto or facetime, we open it in the appropriate app
• If a link has no scheme, we append https and open it in the browser

Testing Details 🔍

• Manual testing