ref(clients): Change defaults for timeouts

[jan-auer]

Our read timeouts have been causing issues on the server side since they cause
the connection to drop, which can leave operations in a dangling state. This has
to be addressed separately, but also uncovered that a default read timeout is
likely not desired by use cases.

This changes timeout functionality in both clients equally:

1. There is a default connect timeout of 100ms
2. There is no default read timeout anymore
3. The timeout / timeout_ms setting only affects read timeouts
4. To set connection timeouts, one has to use the lower-level client config.

This is a BREAKING CHANGE