NewClient completes the initial setup required to get the proxy to a "steady" state.

SupportsFUSE checks if the fusermount binary is present in the PATH or a well known location.

UnixAddress is defined as a function to distinguish between Unix-based implementations where the dir and inst are simply joined, and Windows-based implementations where the inst must be further altered.

Client proxies connections from a local client to the remote server side proxy for multiple Cloud SQL instances.

Config contains all the configuration provided by the caller.

InstanceConnConfig holds the configuration for an individual instance connection.

MultiErr is a group of errors wrapped into one.