[BUG] Fix validation classes

[albx]

Describe the bug

Validation classes must match the behavior described in the official documentation.

To Reproduce

The class is-invalid now has been set on ValidationMessage component (see

bitblazor/src/BitBlazor/Form/BitInputFieldBase.cs

Line 112 in c477d41

protected RenderFragment? RenderValidationMessage()

).

Expected behavior

If the content of a field is invalid, the field itself must have a is-invalid class and the ValidationMessage component must have a just-validate-error-label. If the field is valid it must have a just-validate-success-field css class.

Additional context

In order to implement this behavior EditContext cascading parameter could be used, implementing a custom FieldCssClassProvider and set this implementation via the SetFieldCssClassProvider method.

The RenderValidationMessage method can be moved from BitInputFieldBase class to BitFormComponentBase class.

Here some references:

• https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.components.forms.editcontextfieldclassextensions.setfieldcssclassprovider?view=aspnetcore-9.0
• https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.components.forms.fieldcssclassprovider?view=aspnetcore-9.0