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>

1 files changed, 0 insertions, 6 deletions

diff --git a/tests/specs/task/doc_comments_incorrect/task.out b/tests/specs/task/doc_comments_incorrect/task.out
deleted file mode 100644
index 9d81c1768..000000000
--- a/tests/specs/task/doc_comments_incorrect/task.out
+++ /dev/null
@@ -1,6 +0,0 @@
-Task not found: doesntexist
-Available tasks:
-- lint
-    // some docs
-    // on what this does
-    deno lint