sst/examples/create-sst-rds: Add dynamic JSDoc database type to migration template

[stevenschmatz]

The problem

The migration.ejs.t file uses JSDoc to provide some autocompletion to the db type, but it doesn't make use of the auto-generated types in sql.generated.

This has led to some folks in the SST Discord (and myself) trying to set up TypeScript compilation for these files. But there is a simpler solution.

The solution

JSDoc supports imported types from other files. This makes for some really nice autocompletion without requiring a separate build step or having to worry about anything happening with runtime of the migration itself.

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[jayair]

Oh that's interesting. Thanks for tracking down.