Spring Boot integration to provide protostream support for common Spring classes

Currently SpringEmbeddedModule allows classes from org.springframework.*, but there is no protostream support for them. The 1st candidate would be org.springframework.cache.interceptor.SimpleKey.

P.S. Also would be nice to fix the regular expressions to read:

serializationAllowList.addRegexps("^java\\.util\\..*", "^org\\.springframework\\..*");