fix(castArrayFilters): handle casting on all fields of array filter

[lafeuil]

Summary

When specified an array filter for an update query, only the first field of the filter object is cast.

With this merge request, all fields of the filter are iterated and cast.
Examples

    const schema = new Schema({
      comments: [{
        text: String,
        replies: [{ 
          beginAt: Date, 
          endAt: Date
        }]
      }]
    });
    const q = new Query();
    q.schema = schema;

    q.updateOne({}, { $set: { 'comments.$[x].replies.$[y].endAt': '2019-01-01' } }, {
      arrayFilters: [{ 'x.text': 123 }, { 'y.beginAt': { $gte: '2018-01-01' }, 'y.endAt': { $lt: '2020-01-01' } }]
    });

The endAt field in array filter is not cast to Date.

[vkarpov15]

Nice work, thanks 👍