Fix Keyboard Type Handling by Adding Input Formatter for Number Input in Flutter DivKit

[aliazimoshan]

In the web playground, when the keyboard_type is set to number in JSON, the client-side ensures that users can only input and paste numeric values. However, in the Flutter DivKit, setting the keyboard_type to number only displays the numeric keyboard, but users can still paste or type non-numeric strings. This behavior is inconsistent with the web version, where non-numeric inputs are restricted.

Changes Introduced:

• Added an inputFormatter to DivInput in Flutter DivKit.
• The inputFormatter is set to digitsOnly when keyboard_type is number, ensuring users can only input numeric values.
• For all other keyboard_type values, the inputFormatter is set to none, allowing normal string input.

Impact:

• Ensures consistency between the web and Flutter versions regarding input behavior for numeric fields.
• Prevents users from inputting or pasting non-numeric values when keyboard_type is number in Flutter DivKit.

Testing:

• Verified that when keyboard_type is set to number, users can only input numeric values.
• Confirmed that for other keyboard_type values, normal string input is allowed.

[MANA-Y]

The branch has a conflict and an incorrect diff. Please make a diff that includes only changes that add functionality

[MANA-Y]

And check out the terms of the CLA available at: https://yandex.ru/legal/cla/?lang=en

[lunarstill]

Nothing happens here, conflicts are not resolved yet.