Integrate secret handling with db-details

Add helper function to database model namespace to "swap out" secret values with inserted IDs

Calling this from the pre-update fn

Add pre-insert fn for database model to perform the same

Adding test to database model test ns

Add creator_id to secret model to capture the user who created this secret instance/version

Add creator-id and created-at sub properties for each secret in db details

# Backend changes

Introducing new `superseded-by` property to plugin manifest YAML, which will indicate the driver that is to eventually replace this one (and will drive UI/UX behavior).  If a driver declares this property, then it's considered to be deprecated in favor of the specified one.

Adding top level `test_modules` directory (with the same structure as modules) for the sole purpose of module/plugin testing of YAML files, which will not be included with the driver build

Updating `driver-plugin-manifest` to look for the new `test_modules` directory in addition to `modules`, when loading the driver manifest

# Frontend changes

Calculate `supersededBy` and supersedes maps from the "superseded-by" property for each engine

Change the options for the engine field to use a function to dynamically show the legacy driver if allowed by rules (either the new driver is selected, or the legacy driver was already selected for an existing DB, or the driver is not superseded by anything)

Add new `DriverWarning` component to show these warnings based on supersede status

Co-authored-by: Anton Kulyk <kuliks.anton@gmail.com>