Characters from formatting count towards maxLength for Input fields

### Description of the bug

Characters from formatting count towards maxLength for Input fields, this causes the count of remaining symbols to be incorrect. The following image shows an input field that should say "Du har 7 tegn igjen", it shows 0 due to formatting inserting spaces for numbers, and two punctuations.

Additionally formatting characters count towards the maxlength without accounting for characters consumed by formatting, adjusting to account for maximum length causes maxLength to initially be too large.

Correct behaviour would be to store input to formatted number separately from visual formatting, read maxLength from input while applying format visually.

### Steps To Reproduce

1. Make blank page in altinn studio
2. Use input field with both formatting and maxLength

### Additional Information

Code for field shown:

{
"id": "S08-Input-Kontonummer",
"type": "Input",
"textResourceBindings": {
"title": "S08-Input-Kontonummer.Title",
"description": "S08-Input-Kontonummer.Description"
},
"dataModelBindings": {
"simpleBinding": {
"field": "FlatData.Kontonummer",
"dataType": "DataModel"
}
},
"formatting": {
"number": {
"format": "####.##.#####",
"allowLeadingZeros": true
}
},
"required": true,
"maxLength": 13
},

Start at the Input field's formatting and maxLength handling, using the provided S08-Input-Kontonummer configuration as the reproduction case. Create a blank Altinn Studio page with number formatting and maxLength enabled, then verify that remaining-character counts and the maximum accepted unformatted input exclude visual formatting characters.

Written by the indexing model from the issue text.