Spring-ai PostgresML Auto Configuration

This pull request adds AutoConfiguration for PostgresML.

Checklist: * Sign the contributor license agreement ✅ * Rebase your changes on the latest main branch and squash your commits ✅ * Add/Update unit tests as needed ✅ * Run a build and make sure all tests pass prior to submission ✅

Fixes #242

Comment From: markpollack

Added @AutoConfiguration(after = JdbcTemplateAutoConfiguration.class), copyright headers and updated to recent changes to embedding api (now implementing the core 'model' abstract API classes).

Thanks you very much!

Comment From: markpollack

merged in usrivastava92-postgresml-auto-configuration