SmartPtr: Support load test for source by srs-bench. v6.0.130 (#4097)

1. Add live benchmark support in srs-bench, which only connects and
disconnects without any media transport, to test source creation and
disposal and verify source memory leaks.
2. SmartPtr: Support cleanup of HTTP-FLV stream. Unregister the HTTP-FLV
handler for the pattern and clean up the objects and resources.
3. Support benchmarking RTMP/SRT with srs-bench by integrating the gosrt
and oryx RTMP libraries.
4. Refine SRT and RTC sources by using a timer to clean up the sources,
following the same strategy as the Live source.

---------

Co-authored-by: Haibo Chen <495810242@qq.com>
Co-authored-by: Jacob Su <suzp1984@gmail.com>

trunk/3rdparty/srs-bench/vendor/github.com/haivision/srtgo/accept.go

@@ -0,0 +1,69 @@
+package srtgo
+
+/*
+#cgo LDFLAGS: -lsrt
+#include <srt/srt.h>
+
+SRTSOCKET srt_accept_wrapped(SRTSOCKET lsn, struct sockaddr* addr, int* addrlen, int *srterror, int *syserror)
+{
+	int ret = srt_accept(lsn, addr, addrlen);
+	if (ret < 0) {
+		*srterror = srt_getlasterror(syserror);
+	}
+	return ret;
+}
+
+*/
+import "C"
+import (
+	"fmt"
+	"net"
+	"syscall"
+	"unsafe"
+)
+
+func srtAcceptImpl(lsn C.SRTSOCKET, addr *C.struct_sockaddr, addrlen *C.int) (C.SRTSOCKET, error) {
+	srterr := C.int(0)
+	syserr := C.int(0)
+	socket := C.srt_accept_wrapped(lsn, addr, addrlen, &srterr, &syserr)
+	if srterr != 0 {
+		srterror := SRTErrno(srterr)
+		if syserr < 0 {
+			srterror.wrapSysErr(syscall.Errno(syserr))
+		}
+		return socket, srterror
+	}
+	return socket, nil
+}
+
+// Accept an incoming connection
+func (s SrtSocket) Accept() (*SrtSocket, *net.UDPAddr, error) {
+	var err error
+	if !s.blocking {
+		err = s.pd.wait(ModeRead)
+		if err != nil {
+			return nil, nil, err
+		}
+	}
+	var addr syscall.RawSockaddrAny
+	sclen := C.int(syscall.SizeofSockaddrAny)
+	socket, err := srtAcceptImpl(s.socket, (*C.struct_sockaddr)(unsafe.Pointer(&addr)), &sclen)
+	if err != nil {
+		return nil, nil, err
+	}
+	if socket == SRT_INVALID_SOCK {
+		return nil, nil, fmt.Errorf("srt accept, error accepting the connection: %w", srtGetAndClearError())
+	}
+
+	newSocket, err := newFromSocket(&s, socket)
+	if err != nil {
+		return nil, nil, fmt.Errorf("new socket could not be created: %w", err)
+	}
+
+	udpAddr, err := udpAddrFromSockaddr(&addr)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return newSocket, udpAddr, nil
+}