Feature Request: Show cursor position in the bottom bar

Hello, bothering you again 😅

**Motivation**
When I get a parsing error like `Unexpected token (8:138)` the whole line is being highlighted with red. However, it's not easy to go to exact line and column in the astexplorer textbox.

Would be great to have line and column of cursor in somewhere in bottom bar (maybe left side) to pinpoint the exception in the text.