editor: Improve rewrap of markdown lists, todos, and block quotes (#33702)

Closes #19644 #18151

Now, rewrapping markdown lists (unordered, ordered, and to-do lists) and
block quotes wrap them separately, without merging them together.
Additionally, it correctly indents subsequent lines.

With this input: 

```md
1. This is a list item that is short.
2. This list item is a bit longer because I want to see if it wraps correctly after a rewrap operation in Zed. What do you think?
3. another short item
```

Output would be:

```md
1. This is a list item that is short.
2. This list item is a bit longer because I want to see if it wraps correctly
   after a rewrap operation in Zed. What do you think?
3. another short item
```

Instead of:

```md
1. This is a list item that is short. 2. This list item is a bit longer because 
I want to see if it wraps correctly after a rewrap operation in Zed. What 
do you think? 3. another short item
```

Release Notes:

- Improved rewrap for markdown lists, todos, and block quotes.

crates/languages/src/markdown/config.toml

@@ -13,6 +13,12 @@ brackets = [
     { start = "'", end = "'", close = false, newline = false },
     { start = "`", end = "`", close = false, newline = false },
 ]
+rewrap_prefixes = [
+    "[-*+]\\s+",
+    "\\d+\\.\\s+",
+    ">\\s*",
+    "[-*+]\\s+\\[[\\sx]\\]\\s+"
+]
 
 auto_indent_on_paste = false
 auto_indent_using_last_non_empty_line = false