Summary:
This is a simple one line change. When a red box is launching the editor, if `launchEditor.js` is aware of your editor it can also add a line number to open the file at. So if the stacktrace shows an error on like 56 in `ako.js` then it'll try`wstorm /Users/somelady/src/project/ako.js:56` instead of `wstorm /Users/somelady/src/project/ako.js`.
This adds PyCharm's command line launcher, which is named `charm`. There is existing logic to handle other JetBrains editors, so I just did a simple one line addition.
**Test plan (required)**
* Install PyCharm (if needed)
* Set environment variable `REACT_EDITOR` to `charm`
* Open PyCharm
* Add/replace the current `charm` command via `Tools -> Create Command-line launcher...` in PyCharm.
* Run a React Native project with an error in the source code.
* In the generated red box, click on one of the entries in the stack trace
* File should open in PyCharm at the correct line number.
Closes https://github.com/facebook/react-native/pull/11275
Differential Revision: D4295724
Pulled By: javache
fbshipit-source-id: 29dec525f76c2f0a3ee203cac67408eecc8ac6b6
38d275f8b5