add configuration properties processor

[martinlippert]

adding configuration processor to address #5156

Build doesn't quite work with this change (yet), so this PR needs more work. Some modules seem to have duplicate config properties defined:

[ERROR] /Users/martinlippert/Engineering/projects/spring-ai/vector-stores/spring-ai-mariadb-store/src/test/java/org/springframework/ai/vectorstore/mariadb/MariaDBStoreIT.java:[437,45] Duplicate @ConfigurationProperties definition for prefix 'app.datasource'
[ERROR] /Users/martinlippert/Engineering/projects/spring-ai/vector-stores/spring-ai-mariadb-store/src/test/java/org/springframework/ai/vectorstore/mariadb/MariaDBStoreObservationIT.java:[195,45] Duplicate @ConfigurationProperties definition for prefix 'app.d

Happy to move this forward, but would love to hear your advice on this.