dm 0.2.5

- `mutate()`, `transmute()`, `distinct()` and `summarize()` now support `dplyr::across()` and extra arguments (#640).
- Key tracking for the first three verbs is less strict and based on name equality (#663).
- `relocate()` now works on zoomed `dm` objects (#666).
- `dm_add_fk()` gains `on_delete` argument which `copy_dm_to()` picks up and translates to an `ON DELETE CASCADE` or `ON DELETE NO ACTION` specification for the foreign key (#649).
- `dm_copy_to()` defines foreign keys during table creation, for all databases except DuckDB. Tables are created in topological order (#658). For cyclic relationship graphs, table creation is attempted in the original order and may fail (#664).
- `waldo::compare()` shows better output for dm objects (#642).
- `dm_paste()` output uses trailing commas in the `dm::dm()` and `tibble::tibble()` calls, and sorts column attributes by name, for better modularity (#641).

- New `db_schema_create()`, `db_schema_drop()`, `db_schema_exists()` and `db_schema_list()` replace the corresponding `sql_schema_*()` functions, the latter are soft-deprecated (#670). The connection argument to `db_schema_*()` is called `con`, not `dest` (#668).

- `copy_dm_to()` and `sql_create_schema()` no longer actively check for schema existence (#644, #660).
- Add newline after `OUTPUT` clause for SQL Server (#647).
- Fix `sql_rows_delete()` with `returning` argument for SQL Server (#645).

- Remove method only needed for RSQLite < 2.2.8, add warning if loaded RSQLite version is <= 2.2.8 (#632).
- Adapt MSSQL tests to testthat update (#648).