[JdbcChatMemory] Initialize database schema under different user

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Expected Behavior

For JdbcChatMemory I would like to initialize database schema under different user than used un DataSource.

Current Behavior

Database schema initialized under user defined in datasource.

Context

In production-ready systems different database users have different permissions - ones on DDL, others on DML, so it would be useful to initialize schema under different user.

As a workaround, we can use spring.sql.init properties, where custom custom username/password can be set. But we need to copy initialization script.

Start with JdbcChatMemory's database schema initialization and compare it with the spring.sql.init workaround described in the issue. Determine how separate schema-initialization credentials could be supplied without copying the initialization script. Done means the schema can be initialized under a user different from the DataSource user, with the existing initialization behavior preserved.