accessible with group conditionnality

requests_unixsocket is now an optional dependency, only needed when connecting to redner on a unix socket

Enhance _set_value_from_template to support Redner integration

- Remove deprecated .eslintrc.yml file following Odoo v18 module
    template(odoo_module) recommendations.

- Make ESLINT happy by fixing:

    9:64  warning  Unexpected comment inline with code                          no-inline-comments
    50:17  error    Variable 'placeholder' should be initialized on declaration  init-declarations
    57:21  warning  Unexpected lexical declaration in case block                 no-case-declarations
    69:13  warning  Comments should not begin with a lowercase character         capitalized-comments
    70:45  error    'InputEvent' is not defined                                  no-undef
    71:45  error    'KeyboardEvent' is not defined                               no-undef

- Rename fields/methods for clarity:
  * dynamic_placeholder_button_hidden -> hide_placeholder_button
  * _compute_dynamic_placeholder_button_hidden -> _compute_hide_placeholder_button
- Restructure JS components:
  * Replace dynamic_placeholder_charfield_patch with new component-based implementation
  * Add proper prop handling and converter type awareness
- Add onchange handler to clear value when converter changes
- Refactor placeholder computation using dictionary mapping
- Update XML views with new field names and component parameters
- Improve mimetype.py documentation and default handling

Reuse odoo guess mimetype code and compatibility code between different versions of python-magic.

Also factorize some code and add comment.