feat(fmt): support CSS, SCSS, Sass and Less (#24870)

This PR integrates [Malva](https://github.com/g-plane/malva) into `deno
fmt`, which introduces the ability to format CSS, SCSS, Sass and Less
files.

On Linux x64 6.10, this PR increases about 800KiB:

```                                                                                                                                                                      
❯ wc -c target/release/deno
125168728 target/release/deno

❯ wc -c target/release/deno
124349456 target/release/deno
```

1 files changed, 16 insertions, 2 deletions

diff --git a/tests/integration/fmt_tests.rs b/tests/integration/fmt_tests.rs
index dab2b2ce4..7a37ec2fc 100644
--- a/tests/integration/fmt_tests.rs
+++ b/tests/integration/fmt_tests.rs
@@ -31,6 +31,12 @@ fn fmt_test() {
   let badly_formatted_json = t.path().join("badly_formatted.json");
   badly_formatted_original_json.copy(&badly_formatted_json);
 
+  let fixed_css = testdata_fmt_dir.join("badly_formatted_fixed.css");
+  let badly_formatted_original_css =
+    testdata_fmt_dir.join("badly_formatted.css");
+  let badly_formatted_css = t.path().join("badly_formatted.css");
+  badly_formatted_original_css.copy(&badly_formatted_css);
+
   let fixed_ipynb = testdata_fmt_dir.join("badly_formatted_fixed.ipynb");
   let badly_formatted_original_ipynb =
     testdata_fmt_dir.join("badly_formatted.ipynb");
@@ -49,12 +55,13 @@ fn fmt_test() {
     .current_dir(&testdata_fmt_dir)
     .args_vec(vec![
       "fmt".to_string(),
+      "--unstable-css".to_string(),
       "--unstable-yaml".to_string(),
       format!(
-        "--ignore={badly_formatted_js},{badly_formatted_md},{badly_formatted_json},{badly_formatted_yaml},{badly_formatted_ipynb}",
+        "--ignore={badly_formatted_js},{badly_formatted_md},{badly_formatted_json},{badly_formatted_css},{badly_formatted_yaml},{badly_formatted_ipynb}",
       ),
       format!(
-        "--check {badly_formatted_js} {badly_formatted_md} {badly_formatted_json} {badly_formatted_yaml} {badly_formatted_ipynb}",
+        "--check {badly_formatted_js} {badly_formatted_md} {badly_formatted_json} {badly_formatted_css} {badly_formatted_yaml} {badly_formatted_ipynb}",
       ),
     ])
     .run();
@@ -70,10 +77,12 @@ fn fmt_test() {
     .args_vec(vec![
       "fmt".to_string(),
       "--check".to_string(),
+      "--unstable-css".to_string(),
       "--unstable-yaml".to_string(),
       badly_formatted_js.to_string(),
       badly_formatted_md.to_string(),
       badly_formatted_json.to_string(),
+      badly_formatted_css.to_string(),
       badly_formatted_yaml.to_string(),
       badly_formatted_ipynb.to_string(),
     ])
@@ -88,10 +97,12 @@ fn fmt_test() {
     .current_dir(&testdata_fmt_dir)
     .args_vec(vec![
       "fmt".to_string(),
+      "--unstable-css".to_string(),
       "--unstable-yaml".to_string(),
       badly_formatted_js.to_string(),
       badly_formatted_md.to_string(),
       badly_formatted_json.to_string(),
+      badly_formatted_css.to_string(),
       badly_formatted_yaml.to_string(),
       badly_formatted_ipynb.to_string(),
     ])
@@ -103,16 +114,19 @@ fn fmt_test() {
   let expected_js = fixed_js.read_to_string();
   let expected_md = fixed_md.read_to_string();
   let expected_json = fixed_json.read_to_string();
+  let expected_css = fixed_css.read_to_string();
   let expected_yaml = fixed_yaml.read_to_string();
   let expected_ipynb = fixed_ipynb.read_to_string();
   let actual_js = badly_formatted_js.read_to_string();
   let actual_md = badly_formatted_md.read_to_string();
   let actual_json = badly_formatted_json.read_to_string();
+  let actual_css = badly_formatted_css.read_to_string();
   let actual_yaml = badly_formatted_yaml.read_to_string();
   let actual_ipynb = badly_formatted_ipynb.read_to_string();
   assert_eq!(expected_js, actual_js);
   assert_eq!(expected_md, actual_md);
   assert_eq!(expected_json, actual_json);
+  assert_eq!(expected_css, actual_css);
   assert_eq!(expected_yaml, actual_yaml);
   assert_eq!(expected_ipynb, actual_ipynb);
 }