Add Jackson Module for Spring Session

[marcusdacoregio]

Since Spring Session defines its own types to be serialized and, therefore, has different needs than Spring Security, we should provide a Jackson Module that registers the required mixins.

See:

• https://github.com/spring-projects/spring-session/issues/2227
• https://github.com/spring-projects/spring-security/issues/4889
• https://github.com/spring-projects/spring-security/issues/12294

[leshalv]

When will the plan come into operation？