Introduces "func-param-threshold" to support expanding function (and receiver method) arguments across multiple lines if there is more than N arguments.

Disabled by default. Signatures with a parameter count less than the threshold are left alone.

For example, with the threshold of 3:

func myFunc(a int, b string, c bool) error {
  return nil
}

func myFunc(
  a int,
  b string,
  c bool,
) error {
  return nil
}