Integer custom field to be numerical input instead of a drop-down

[sakiss]

Pull Request for Issue #42579

Summary of Changes

So far the Integer custom field is a drop-down list.
Though it is crashing the browser when the list becomes too long. Moreover it is really hard to use, after a certain length.

With the PR the Integer custom field is an input of type number. Though, it still follows the min, max and step settings, that existed.

Testing Instructions

Try setting up a custom field of type "Integer" for an article.
Within the article you will see an input, instead of a drop-down,

Actual result BEFORE applying this Pull Request

Drop-down list.

Expected result AFTER applying this Pull Request

Input of type number

Link to documentations

DKN

[Fedik]

Thanks for the PR.
Before you continue. We should not change existing integer field. And instead of it, need to create a new Number custom field, which will use NumberField class.