Add support for SSL Bundles

[flinden68]

In Spring Boot since 3.2.0 there is support for SSL Bundles.
Only 1 time set all the relative keys and certficates and specify in the webclient which bundle to use

Very usefull if all external API's goes via a Gateway.

• add an optional property 'bundle' to the Ssl property classs
• changes the Webclient creation by adding support for this new property.
• code is backwards compatible

Ssl bundles