feat(task): Task description in the form of comments (#23101)

Closes #22786.

TLDR;
```jsonc
{
  "tasks": {
    // Some comment
    //
    // describing what the task does
    "dev": "deno run -A --watch main.ts"
  }
}
```
```bash
deno task
```
![Screenshot 2024-03-27 at 1 43
49 PM](https://github.com/denoland/deno/assets/17734409/7a14da8c-8e63-45ba-9bfb-590d250b56a9)

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/specs/task/doc_comments_incorrect/deno.jsonc b/tests/specs/task/doc_comments_incorrect/deno.jsonc
new file mode 100644
index 000000000..6b27f2850
--- /dev/null
+++ b/tests/specs/task/doc_comments_incorrect/deno.jsonc
@@ -0,0 +1,7 @@
+{
+  "tasks": {
+    // some docs
+    // on what this does
+    "lint": "deno lint"
+  }
+}