Formatter: wrap_long_dict_values_in_parens preview style

[MichaReiser]

Implement Black's wrap_long_dict_values_in_parens style as a Ruff preview style.

Note:
This new style may not be accepted as part of Black's 2024 style guide.

my_dict = {
    "a key in my dict": a_very_long_variable * and_a_very_long_function_call() * and_another_long_func() / 100000.0
}

Ruff Stable

my_dict = {
    "a key in my dict": a_very_long_variable
    * and_a_very_long_function_call()
    * and_another_long_func()
    / 100000.0
}

Black Preview

my_dict = {
    "a key in my dict": (
        a_very_long_variable
        * and_a_very_long_function_call()
        * and_another_long_func()
        / 100000.0
    )
}

This new style does not apply to subscripts, although it probably should? But this is a non goal for now and tracked separately

[MichaReiser]

We don't plan to implement this preview style as part of Ruff's 2024 style guide because we believe that improving the binary expression formatting solves the problem more holistically. See psf/black#4123 for the details

[MichaReiser]

This style did not ship as part of Black 24