Add an file.headings array

[Drakan1]

Is your feature request related to a problem? Please describe.
Dataview works great for sorting by files / tags / lists. I like to keep projects in headings in a file. Hence, I want access to the headings data in an array

Describe the solution you'd like
An array of all of the file headings.

## Test
### Test2

file.headings -> [Test, Test2] for example or even an N-dimensional list [{"Test":[{"Test2":""}]}]. Similar to the built-in outline feature in Obsidian

Describe alternatives you've considered
n/a

Additional context
What I would really like to do embed the obsidian outline feature produced through a dataview query.
Using the above example
to produce:

- [[#Test]]
    - [[#Test 2]]

An array of all headings within the note