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-utils/src/sample_config/default_config.nu

@@ -283,9 +283,9 @@ let-env config = {
     format: "auto" # b, kb, kib, mb, mib, gb, gib, tb, tib, pb, pib, eb, eib, zb, zib, auto
   }
   cursor_shape: {
-    emacs: line # block, underscore, line (line is the default)
-    vi_insert: block # block, underscore, line (block is the default)
-    vi_normal: underscore # block, underscore, line  (underscore is the default)
+    emacs: line # block, underscore, line, blink_block, blink_underscore, blink_line (line is the default)
+    vi_insert: block # block, underscore, line , blink_block, blink_underscore, blink_line (block is the default)
+    vi_normal: underscore # block, underscore, line, blink_block, blink_underscore, blink_line (underscore is the default)
   }
   color_config: $dark_theme   # if you want a light theme, replace `$dark_theme` to `$light_theme`
   use_grid_icons: true