Customize ReCaptcha

[sebastienros]

Comment about this PR

This is about being able to add custom attributes to the tag helper. Tag helpers should already support that, or we should provide a way to customize the view (using a shape?).

There is ReCaptchaPart.cshtml that is using the tag helper. This is a shape that can be customized in a theme.

There is also Recaptcha.cshtml which is a view that also uses the tag helper.

A refactoring could be to have a single shape that can be customized. The shape model would have the required properties that are configured (api urls, keys, ...).