Ambitus with multiple voices

Adding the Ambitus_engraver to the Staff context creates a single ambitus per staff, even in the case of staves with multiple voices.

\version "2.24.0"

\new Staff \with {
  \consists "Ambitus_engraver"
  }
<<
  \new Voice \relative c'' {
    \voiceOne
    c4 a d e
    f1
  }
  \new Voice \relative c' {
    \voiceTwo
    es4 f g as
    b1
  }
>>