Pressing Enter In A List Element Should Start Newline With '-'

If I am entering in a list element in a YAML document and press enter, it would be nice if this extension begins the new line with a - character. This allows me to easily enter in another element into the list, rather than having to type - and SPACE every time (imagine me typing a long list and how tedious this can get).

I think this makes a lot of natural sense to me and I have seen other YAML editors autocomplete the start of list elements this way (I have most definitely observed JetBrains IDEs act this way). The worst case scenario is that if I don't want to continue entering in list elements on the newline, I just have to press backspace a couple extra times. I would have had to press backspace anyway if my next line were something like a node at a higher level in the YAML document.

No file or test is named. Start by locating the VS Code YAML extension's handling of Enter inside YAML list elements and any existing editor behavior tests; done means pressing Enter after a list item inserts the expected '-' prefix without disrupting higher-level YAML editing.