[BUGFIX] Implement Focus Out Event Handling for Input Controls

[nagarajpandith]

This PR adds an onBlur event handler to the input control in Taipy GUI, ensuring that input validation is triggered when the user focuses out of the input field. Fixes #2023 @FabienLelaquais @jrobinAV

Changes:

• Added handleBlur function to dispatch the update action when the input field loses focus.
• Ensured that all input types (text, number, date) are affected by this change.

Acceptance Criteria:

• Input controls should now validate on focus out, equivalent to pressing the Enter key.
• All new code is unit tested with a code coverage of at least 90%.