4553160685
Add support for creating DB connection pools without establishing connections up front. This is already supported by SQLx via the [Pool::connect_lazy](https://docs.rs/sqlx/latest/sqlx/struct.Pool.html#method.connect_lazy) method. This PR adds a new `connect_lazy` option to `database::ConnectOptions`. If set to `true`, the SQLx `Pool` will be created using the `Pool::connect_lazy_with` method; otherwise, the `Pool::connect_with` method will be used (e.g., the existing behavior). This "lazy" behavior is implemented for each DB variant (Postgres/MySQL/SQLite). This was discussed previously [here](https://github.com/SeaQL/sea-orm/discussions/1645), but it appears support was never added to SEA ORM directly.