Add Size Attribute Support for InputGroup

[abhishek-junghare]

Currently, form components like InputText or Select support a size attribute for better customization and consistent styling. However, the InputGroup component lacks this feature. Adding size attribute support to InputGroup would provide consistency across form elements and enhance its usability for developers.

For reference, size attribute support in Select: https://primevue.org/selectbutton/#sizes

This enhancement would align InputGroup with other form components and improve the overall design consistency.