[Request] Database initialization and migration

[andrewazores]

Describe the feature

Related to cryostatio/cryostat-operator#814

Once the postgres database is deployed separately and it has its own lifecycle, the database should be initialized using SQL scripts rather than by Hibernate's drop-and-create schema. We should also use some tool, such as Flyway, to facilitate database schema upgrades for future versions.

Anything other information?

No response