PostgreSQL network ("wire") protocol.
For brevity, we often refer to the protocol as "pgwire," hence the name of this module. Beware that this name is only commonly used in the CockroachDB and Materialize ecosystems. The PostgreSQL documentation, for example, uses the long-winded "Frontend/Backend Protocol" title instead.
A Tokio codec to encode and decode pgwire frames.
Reports whether the given stream begins with a pgwire handshake.