feat: new [taxonomy].extended.json with extended synonyms

[stephanegigandet]

This creates a new .extended.json file for all taxonomies, that contain extended synonyms.
Fixes #10742

Notes:

• synonyms_extended entries are normalized (no accents, capitals, all non letter chars turned to dashes etc.)
• synonyms are not normalized (as in the normal export)
• properties, parents, childrens are not included (they are in the .full export)
• the .full export is not changed (it does not contain the extended synonyms)

Sample output in test taxonomy:

en:passion-fruit-yogurts: {
synonyms_extended: { },
normalized_synonyms: {
nl: [
"yoghurts-met-passievrucht"
],
en: [
"passion-fruit-yogurts"
],
fr: [
"yaourts-au-fruit-de-la-passion"
]
},
name: {
nl: "Yoghurts met passievrucht",
fr: "Yaourts au fruit de la passion",
en: "Passion fruit yogurts"
},
normalized_synonyms_extended: {
en: [
"passion-fruit-yoghurts",
"passion-fruit-yogurts",
"passionfruit-yoghurts",
"passionfruit-yogurts"
],
fr: [
"yaourts-au-fruit-de-la-fruits-de-la-passion",
"yaourts-au-fruit-de-la-maracuja",
"yaourts-au-fruit-de-la-passion",
"yaourts-au-fruits-de-la-passion",
"yaourts-au-maracuja",
"yaourts-au-passion",
"yoghourts-au-fruit-de-la-fruits-de-la-passion",
"yoghourts-au-fruit-de-la-maracuja",
"yoghourts-au-fruit-de-la-passion",
"yoghourts-au-fruits-de-la-passion",
"yoghourts-au-maracuja",
"yoghourts-au-passion",
"yogourts-au-fruit-de-la-fruits-de-la-passion",
"yogourts-au-fruit-de-la-maracuja",
"yogourts-au-fruit-de-la-passion",
"yogourts-au-fruits-de-la-passion",
"yogourts-au-maracuja",
"yogourts-au-passion"
],
nl: [
"yoghurts-met-passievrucht"
]
}
},

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[alexgarel]

FYI, I added #10745

[alexgarel]

Great