feat(sqlite): `SqliteCryptoStore` has 1 write connection.
Similarly to #5382 and #5744, this patch introduces a write-only
connection in `SqliteCryptoStore`. The idea is to get many read-only
connections, and a single write-only connection behind a lock, so that
there is a single writer at a time.
This patch renames the `acquire` method to `read`, and it introduces a
new `write` connection.