`lily migrate` can use `--storage` arg instead of `--db` and `--schema`

### Description

Typically when deploying Lily, a `config.toml` is created to setup persistence targets for jobs via the `--storage` arg (which is the only way to configure persistence options on a Job. This is inconsistent with `lily migrate` which require `--db` and `--schema` flags. As a suggested UX improvement, it would good to make `lily migrate --storage` the default interaction and deprecate the old flags.

### Acceptance criteria

- Storage options passed in as `lily migrate --storage=TARGET` instead of `lily migrate --db=LONGCONNECTIONSTRING --schema=SCHEMANAME`.

### Where to begin

- Add `--storage`
- Deprecate `--db` and `--schema` with notice while still respecting their values