Add comprehensive SCTP protocol support

Implement full SCTP (Stream Control Transmission Protocol) layer with support for:

Core Protocol (RFC 9260):
- All standard chunk types (DATA, INIT, INIT-ACK, SACK, HEARTBEAT, ABORT,
  SHUTDOWN, ERROR, COOKIE-ECHO, COOKIE-ACK, ECNE, CWR, SHUTDOWN-COMPLETE)
- CRC32c checksum calculation and validation
- Chunk and parameter action bits helpers
- Bundling validation per RFC 9260
- Host Name Address deprecation detection

Extensions:
- AUTH chunk with HMAC-SHA1/SHA256 computation and verification (RFC 4895)
- ASCONF/ASCONF-ACK for dynamic address reconfiguration (RFC 5061)
- RE-CONFIG for stream reconfiguration (RFC 6525)
- FORWARD-TSN for partial reliability (RFC 3758)
- I-DATA and I-FORWARD-TSN for message interleaving (RFC 8260)
- PAD chunk (RFC 4820)
- NR-SACK experimental support (IANA registered, draft-based)
- Zero Checksum Acceptable parameter (RFC 9653)

Additional features:
- Parameter iterators for INIT, RE-CONFIG, and ASCONF chunks
- Error cause iterator for ABORT/ERROR chunks
- Extended PPID enum with 70+ protocol identifiers from IANA registry
- Chunk creation APIs for building SCTP packets

Includes 72 test cases covering parsing, creation, and validation.

Author: jordanvrtanoski

Packet++/CMakeLists.txt

@@ -46,6 +46,7 @@ add_library(
   src/RadiusLayer.cpp
   src/RawPacket.cpp
   src/S7CommLayer.cpp
+  src/SctpLayer.cpp
   src/SdpLayer.cpp
   src/SingleCommandTextProtocol.cpp
   src/SipLayer.cpp
@@ -125,6 +126,7 @@ set(
   header/RadiusLayer.h
   header/RawPacket.h
   header/S7CommLayer.h
+  header/SctpLayer.h
   header/SdpLayer.h
   header/SingleCommandTextProtocol.h
   header/SipLayer.h

Packet++/header/IPv4Layer.h

@@ -97,6 +97,8 @@ namespace pcpp
 		PACKETPP_IPPROTO_DSTOPTS = 60,
 		/// VRRP protocol
 		PACKETPP_IPPROTO_VRRP = 112,
+		/// SCTP (Stream Control Transmission Protocol)
+		PACKETPP_IPPROTO_SCTP = 132,
 		/// Raw IP packets
 		PACKETPP_IPPROTO_RAW = 255,
 		/// Maximum value

Packet++/header/ProtocolType.h

@@ -254,6 +254,9 @@ namespace pcpp
 	/// FTP protocol family (FTPControl and FtpData protocols)
 	const ProtocolTypeFamily FTP = 0x3c29;
 
+	/// SCTP (Stream Control Transmission Protocol)
+	const ProtocolType SCTP = 62;
+
 	/// @}
 
 	/// An enum representing OSI model layers