Move binpac code into the main Zeek repository

This is based on commit 48f75b5f6415fe9d597e3e991cec635b1bc400dc from
the binpac repository.

tools/binpac/lib/binpac_analyzer.h

@@ -0,0 +1,24 @@
+#ifndef binpac_an_h
+#define binpac_an_h
+
+namespace binpac {
+
+// TODO: Add the Done() function
+
+// The interface for a connection analyzer
+class ConnectionAnalyzer {
+public:
+    virtual ~ConnectionAnalyzer() = default;
+    virtual void NewData(bool is_orig, const unsigned char* begin_of_data, const unsigned char* end_of_data) = 0;
+};
+
+// The interface for a flow analyzer
+class FlowAnalyzer {
+public:
+    virtual ~FlowAnalyzer() = default;
+    virtual void NewData(const unsigned char* begin_of_data, const unsigned char* end_of_data) = 0;
+};
+
+} // namespace binpac
+
+#endif // binpac_an_h