This adds a codefix to convert 'positional' DU bindings and match patterns to 'named' DU versions.

Example:

type Person = Person of first: string * middle: string option * last: string

let (Person(f, m, l)) = person
// becomes
let (Person(first = f; middle = m; last = l)) = person

It also works with scenarios where a DU has been updated with more fields than a positional pattern accounts for:

type B = B of a: char * b: bool

let b = B(' ', true)

match b with
| B('a') -> ()

// becomes

match b with
| B(a = 'a', b = _;) -> ()

In each case, the entire range of the pattern of the positional binding is used as the right-hand side of the matching named pattern.

Tests added!