feat(task): support object notation, remove support for JSDocs (#26886)

This commit changes three aspects of `deno task`:
1. Tasks can now be written using object notation like so:
```jsonc
{
  "tasks": {
     "foo": "deno run foo.js",
     "bar": {
        "command": "deno run bar.js"
     }
}
```
2. Support for comments for tasks is now removed. Comments above tasks
will
no longer be printed when running `deno task`.
3. Tasks written using object notation can have "description" field that
replaces
support for comments above tasks:
```jsonc
{
  "tasks": {
     "bar": {
        "description": "This is a bar task"
        "command": "deno run bar.js"
     }
}
```
```
$ deno task
Available tasks:
- bar
    // This is a bar task
    deno run bar.js
```

Pulled most of the changes from
https://github.com/denoland/deno/pull/26467 to
support "dependencies" in tasks. Additionally some cleanup was performed
to make code easier to read.

---------

Co-authored-by: David Sherret <dsherret@gmail.com>

3 files changed, 16 insertions, 0 deletions

diff --git a/tests/specs/task/description/__test__.jsonc b/tests/specs/task/description/__test__.jsonc
new file mode 100644
index 000000000..100550de0
--- /dev/null
+++ b/tests/specs/task/description/__test__.jsonc
@@ -0,0 +1,4 @@
+{
+  "args": "task",
+  "output": "main.out"
+}
diff --git a/tests/specs/task/description/deno.json b/tests/specs/task/description/deno.json
new file mode 100644
index 000000000..a86b7a5dc
--- /dev/null
+++ b/tests/specs/task/description/deno.json
@@ -0,0 +1,8 @@
+{
+  "tasks": {
+    "echo_emoji": {
+      "description": "This is some task",
+      "command": "echo 1"
+    }
+  }
+}
diff --git a/tests/specs/task/description/main.out b/tests/specs/task/description/main.out
new file mode 100644
index 000000000..ed2850656
--- /dev/null
+++ b/tests/specs/task/description/main.out
@@ -0,0 +1,4 @@
+Available tasks:
+- echo_emoji
+    // This is some task
+    echo 1