Add Go to Next/Prev Symbol Highlight support

[danielpaz6]

In Jetbrain in order to move to the next/prev symbol, you press CTRL + OPTION + DOWN for next symbol highlight and CTRL + OPTION + UP for previous symbol highlight.
In Visual Studio Code you press F7 to next and SHIFT+F7 for prev.

[kasecato]

• IntelliJ: Next Highlighted Usage
• macOS: ctrl+alt+down
• Win: none
• Linux: none

{
  "key": "f7",
  "command": "editor.action.wordHighlight.next",
  "when": "editorTextFocus && hasWordHighlights"
}

[kasecato]

This was released on v1.7.4