Floating labels for textareas and select

Hello,

I've been working on addressing this issue and have created a MR with the necessary adjustments. Here's an overview of the changes:

1- Removed Exclusions: In the bootstrap_barrio.theme file, I've removed the lines that excluded select and textarea from floating labels support.

2- Textarea Adjustments:
- Twig template updated: I modified the textarea twig template to adjust its height based on Bootstrap's recommendation. This will ensure a more consistent and visually appealing form design.
- Height Consistency: I've updated the textarea twig template to include a height of 150px. This ensures that textareas maintain a consistent height irrespective of whether the floating label feature is activated or not.
- Hook Preprocess for Textarea: I introduced a hook_preprocess_textarea in the theme file. This hook checks if the 'float_label' theme setting is enabled and accordingly sets a placeholder for the textarea. This placeholder is essentially the title of the textarea, making it intuitive for end-users.

3 - Floating Labels for Select Inputs: Following the Bootstrap documentation, the <label> for .form-selects is always displayed in its floated state. This caters to Bootstrap's specifications and ensures a unified design approach.

Please review the changes and let me know if there are further adjustments needed.

Have tested it on the contact form and the variable "float_label" is not addressed in "textarea.html.twig". So the style (150px) is not applied and the "text-wrapper" remains.