Add colored underline support

This commit adds support for colored underline and refines the dynamic
extra storage. The extra storage now is using `Arc` making cloning it way
faster compared to `Box` approach which scales really well when it comes
to cloning in `Term::write_at_cursor`, since cloning `Arc` is constant
time.

Fixes #4142.

alacritty_terminal/tests/ref.rs

@@ -52,6 +52,7 @@ ref_tests! {
     zerowidth
     selective_erasure
     colored_reset
+    colored_underline
     delete_lines
     delete_chars_reset
     alt_reset

alacritty_terminal/tests/ref/colored_underline/alacritty.recording

@@ -0,0 +1,3 @@
+%                                                                                                                                           
 
]133;A]2;kchibisov@Zodiac:~/src/rust/alacritty-workspace/fork
fork on  colored-underlines-v3 via 🦀 v1.59.0 ➜ [?2004hcargo run -- --ref-test --config-file /dev/null -o scrolling.history=0echo -e '\e[58;2;255;0;255m\e[4:1mUNDERLINE\e[4:2mDOUBLE\e[58:5:196m\e[4:3mUh̷̗ERCURL\e[4:4mDOTTED\e[4:5mDASHED\e[59mNOT_COLORED_DASH\e[0m'[?2004l
+]2;echo -e '\e[58;2;255;0;255m\e[4:1mUNDERLINE\e[4:2mDOUBLE\e[58:5:196m\e[4:3mUh̷̗ERCURL\e[4:4mDOTTED\e[4:5mDASHED\e[59mNOT_COLORED_DASH\e[0m'[4:1mUNDERLINE[4:2mDOUBLE[58:5:196m[4:3mUh̷̗ERCURL[4:4mDOTTED[4:5mDASHEDNOT_COLORED_DASH
+%                                                                                                                                           
 
]133;A]2;kchibisov@Zodiac:~/src/rust/alacritty-workspace/fork
fork on  colored-underlines-v3 via 🦀 v1.59.0 ➜ [?2004h[?2004l

alacritty_terminal/tests/ref/colored_underline/config.json

@@ -0,0 +1 @@
+{"history_size":0}

alacritty_terminal/tests/ref/colored_underline/size.json

@@ -0,0 +1 @@
+{"width":1262.0,"height":690.0,"cell_width":9.0,"cell_height":18.0,"padding_x":0.0,"padding_y":0.0,"screen_lines":38,"columns":140}