support blink cursor, and fix underscore's cursorshape (#8990)

# Description
Close: #8988

Thanks to new crossterm version, nushell can support blink cursor shape.
It can be config with the following value:
1. blink_block
2. blink_line
3. blink_underscore

And original block, line, underscore will be steady. It also fixes wrong
shape of `underscore`.

# User-Facing Changes
Here is a little breaking change, before the change: `line` cursor shape
is blinking line, but after this pr, it will be `steady line`. To make a
blink line, we need to change the value to `blink_line`.

But I think it's ok, because after the change, we have a good naming
convention about the name of shape

# Tests + Formatting
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crates/nu-cli/src/repl.rs

@@ -716,8 +716,11 @@ pub fn evaluate_repl(
 fn map_nucursorshape_to_cursorshape(shape: NuCursorShape) -> SetCursorStyle {
     match shape {
         NuCursorShape::Block => SetCursorStyle::SteadyBlock,
-        NuCursorShape::UnderScore => SetCursorStyle::DefaultUserShape,
-        NuCursorShape::Line => SetCursorStyle::BlinkingBar,
+        NuCursorShape::UnderScore => SetCursorStyle::SteadyUnderScore,
+        NuCursorShape::Line => SetCursorStyle::SteadyBar,
+        NuCursorShape::BlinkBlock => SetCursorStyle::BlinkingBlock,
+        NuCursorShape::BlinkUnderScore => SetCursorStyle::BlinkingUnderScore,
+        NuCursorShape::BlinkLine => SetCursorStyle::BlinkingBar,
     }
 }