Enhancement - Add in idleTimeOut support for HTTP Server

[galen0624]

Add in support for

// A Server defines parameters for running an HTTP server.
// The zero value for Server is a valid configuration.
type Server struct {
	// IdleTimeout is the maximum amount of time to wait for the
	// next request when keep-alives are enabled. If IdleTimeout
	// is zero, the value of ReadTimeout is used. If both are
	// zero, ReadHeaderTimeout is used.
	IdleTimeout time.Duration
}

Update the below struct and config to support idle time out

type Listen struct {
	Addr               string
	Proto              string
	ReadTimeout        time.Duration
	WriteTimeout       time.Duration
	CertSource         CertSource
	StrictMatch        bool
	TLSMinVersion      uint16
	TLSMaxVersion      uint16
	TLSCiphers         []uint16
	ProxyProto         bool
	ProxyHeaderTimeout time.Duration
}

We have an issue where applications that use text/event-stream (SSE) run into a read time out and the connection is dropped.

I will PR an update to add in idleTimeOut Support.