Summary

I really want to be able to use the COM812 rule, but our codebase contains a ton of code like the following:

some_string = gettext(
    'This is a long string which '
    'is marked for internationalization'
)

another_function(
    some_long +
    expression +
    gets_passed
)

While trailing commas do make a lot of sense for function calls that contain multiple arguments, for functions that take a single argument, requiring them muddies the syntax. I'd love to have an option for the flake8-commas plugin (something like [lint.flake8-commas] allow-single-arg-function-calls = true)

I'm happy to do the implementation for this, but I wanted to check in first to see if this is something that would be accepted.