Array of objects json export reviwed

[JuanBerrocal]

I looked into this issue. The problem was that the array of objects are never processed.
In the file: src\pods\toolbar\components\export-button\export-button.business.ts
This function: getPropertyJsonSchema suposses that every array is made up of base type items.
When an array is found, always made this:
return "${field.name}": { bsonType: "array", items: ${field.type} };
So if an object is the item of an array, always returns:
return "${field.name}": { bsonType: "array", items: "object" };
But doesnt return any property from the object.
To resolve this I've used a new function, getItemType.
This function process every item from the array and make a recursive call on getPropertiesJsonSchema if necessary.
So nested objects are also treated.