Benchmarking, packaging, and fix issues, tests and perfomance (#797)

### performance
- handling of the very big packet(any size that can be buffered)
- speeding up TCP sessions by using message hints: Added **proto.HasFullPayload** that helps to validate the entire HTTP request, it supports `Chunked` encoding too! Added **proto.HasRequestTitle** and **proto.HasResponseTitle** for validating the beginning of HTTP request. Those methods are used `input_raw.go` with `TCP`.
- supports Keep-Alive: the above functions helps to support keep-alive

### Packaging
- **capture:** engines(capture/doc.go)
- **tcp:** tcp message parser (tcp/doc.go)

### benchmarking
- **capture.BenchmarkPcapDump:** the benchmarks regarding dumping packets in a pcap file
- **capture.BenchmarkPcapFile:** the benchmarks of reading packets from a pcap file
- **capture.BenchmarkPcap:** the benchmarks of parsing packets from the loopback interface with pcap handles
- **proto.BenchmarkHasFullPayload:**: benchmarking this function which validates the HTTP payload
- **tcp.BenchmarkPacketParseAndSort:** benchmarks of parsing and sorting packets
- **tcp.BenchmarkMessageParserWithoutHint:** benchmarks of message reasembling by using `SYN` and `FIN` flag
- **tcp.BenchmarkMessageParserWithHint:** benchmarks of message reasembling by using `proto.HasRequestTitle` and `proto.HasFullPayload` flag

### issues
see linked issues

###  tests
- fixed input raw and engine tests

**Most of the changed of the files, was about using functionalities of** `tcp` **and** `capture` **in existing functionalities**

output_binary.go

@@ -4,13 +4,15 @@ import (
 	"io"
 	"sync/atomic"
 	"time"
+
+	"github.com/buger/goreplay/size"
 )
 
 // BinaryOutputConfig struct for holding binary output configuration
 type BinaryOutputConfig struct {
 	Workers        int           `json:"output-binary-workers"`
 	Timeout        time.Duration `json:"output-binary-timeout"`
-	BufferSize     int           `json:"output-tcp-response-buffer"`
+	BufferSize     size.Size     `json:"output-tcp-response-buffer"`
 	Debug          bool          `json:"output-binary-debug"`
 	TrackResponses bool          `json:"output-binary-track-response"`
 }
@@ -78,7 +80,7 @@ func (o *BinaryOutput) startWorker() {
 	client := NewTCPClient(o.address, &TCPClientConfig{
 		Debug:              o.config.Debug,
 		Timeout:            o.config.Timeout,
-		ResponseBufferSize: o.config.BufferSize,
+		ResponseBufferSize: int(o.config.BufferSize),
 	})
 
 	deathCount := 0
@@ -135,7 +137,7 @@ func (o *BinaryOutput) Write(data []byte) (n int, err error) {
 func (o *BinaryOutput) Read(data []byte) (int, error) {
 	resp := <-o.responses
 
-	Debug("[OUTPUT-TCP] Received response:", string(resp.payload))
+	Debug(2, "[OUTPUT-TCP] Received response:", string(resp.payload))
 
 	header := payloadHeader(ReplayedResponsePayload, resp.uuid, resp.startedAt, resp.roundTripTime)
 	copy(data[0:len(header)], header)
@@ -163,7 +165,7 @@ func (o *BinaryOutput) sendRequest(client *TCPClient, request []byte) {
 	stop := time.Now()
 
 	if err != nil {
-		Debug("Request error:", err)
+		Debug(1, "Request error:", err)
 	}
 
 	if o.config.TrackResponses {