Preview: handle more huggable immediately nested parens/brackets

[yilei]

Describe the style change

#3964 handled the most common case from #1811, and I'd like the following cases to be handled too:

foo(
    (
        1,
        2,
        3,
    )
)

foo([
    [
        1,
        2,
        3,
    ]
])

See playgroud.

Desired style

foo((
    1,
    2,
    3,
))

foo([[
    1,
    2,
    3,
]])

Additional context

I'll send a PR if this proposal looks good.

[JelleZijlstra]

Sounds good, thanks!

[yilei]

Add two more cases that aren't function calls:

Before:

nested_mapping = {
    "key": [
        {
            "a very long key 1": "with a very long value",
            "a very long key 2": "with a very long value",
        }
    ]
}

nested_array = [
    [
        1,
        2,
        3,
    ]
]

After:

nested_mapping = {
    "key": [{
        "a very long key 1": "with a very long value",
        "a very long key 2": "with a very long value",
    }]
}

nested_array = [[
    1,
    2,
    3,
]]