Right now the behavior is hardcoded to log any received notices at the
info level. Add a `notice_callback` configuration option that permits
installing an arbitrary callback to handle any received notices.
As discussed in #588.
Revives #184.
The rewrite for async/await and Tokio accidentally lost functionality
that allowed users to assign specific names to savepoints when using
nested transactions. This functionality had originally been added
in #184 and had been updated in #374.
This commit revives this functionality using a similar scheme to the
one that existed before. This should allow CockroachDB users to update
to the next patch release of version `0.17`.
Rather than taking in a Stream and advancing it internally, return a
Sink that can be advanced by the calling code. This significantly
simplifies encoding logic for things like tokio-postgres-binary-copy.
Similarly, the blocking interface returns a Writer.
Closes#489
