New feature: Send/Evaluate code in REPL terminal

Would be really great If one could send/evaluate selected lines of code in active REPL terminal window instead of using output window. I mean something like [SublimeREPL package](https://github.com/wuub/SublimeREPL) for Sublime Text does. You write code in a file with nice editor features (autocomplete etc) , select a piece of code, hit alt+enter, and the code is evaluated in REPL. I really love that experience, and I couldn't find any extension that does this in VS Code.