Sort formatted values in vector API response (`ordering` + `fformatter` params)

[Raruto]

Checklist

• [X] I've searched through the current issues to make sure this feature hasn't been requested already.

Motivation

Be able to sort the the following values by "formatted" field value instead of by field key:

https://v37.g3wsuite.it/vector/api/data/qdjango/97/buildings_2f43dc1d_6725_42d2_a09b_dd446220104a/?fformatter=address&ordering=address

// current behavior

"data": [
  [ "A101", "Via Sallustio Bandini" ],
  [ "A102", "Via Atto Vannucci" ],
  [ "A103", "Via Alfredo Oriani gia' Via Vecchia" ],
  [ "A106", "Piazza Pietro Leopoldo" ],
  [ "A107", "Via Ubaldo Montelatici" ],
  [ "A108", "Via Giandomenico Romagnosi" ],
  [ "B002", "Via Giovanni Lampredi" ],
  [ "C106", "Via Pietro Cironi" ],
  [ "C107", "Via Pietro Corridoni" ]
],

Suggested solution

Introduce a new parameter or change the ordering behavior so that response can be like following:

// desired behavior

"data": [
  [ "A106", "Piazza Pietro Leopoldo" ],
  [ "A103", "Via Alfredo Oriani gia' Via Vecchia" ],
  [ "A102", "Via Atto Vannucci" ],
  [ "A108", "Via Giandomenico Romagnosi" ],
  [ "B002", "Via Giovanni Lampredi" ],
  [ "C106", "Via Pietro Cironi" ],
  [ "C107", "Via Pietro Corridoni" ],
  [ "A101", "Via Sallustio Bandini" ],
  [ "A107", "Via Ubaldo Montelatici" ]
],

NB the sorting algo must also take into account numeric, null and boolean values (see below)

Alternatives considered

Formatted values can be sorted on client-side, but this make every API calls code even more complex/unreliable:

fetch('https://v37.g3wsuite.it/vector/api/data/qdjango/97/buildings_2f43dc1d_6725_42d2_a09b_dd446220104a/?fformatter=address' /* + '&ordering=address' */)
  .then(d => d.json())
  // sorted by fformatter
  .then(d => d.data.sort((a, b) => `${a[1]}`.localeCompare(b[1], undefined, 'number' === typeof a[1] ? { numeric: true } : { sensitivity: 'base' })))