OMRSOCK API: Implement OMRAddrInfoNode Element Extraction Functions on Unix

[caohaley]

Working on Issue: #4102
/cc @rwy0717 @babsingh @mpirvu

Omrsock functions to be implemented:
omrsock_getaddrinfo_length, omrsock_getaddrinfo_family, omrsock_getaddrinfo_socktype, omrsock_getaddrinfo_protocol

Description

We will be implementing functions that can extract length, family, socktype, and protocol from OMRAddrInfoNode and from addrInfo of OMRAddrInfoNode.

OMRAddrInfoNode struct has the definition:

typedef struct OMRAddrInfoNode {
	/**
	 * Pointer to the first addrinfo node in listed list. Defined differently depending on the operating system. 
	 */
	omr_os_addrinfo *addrInfo;
	
	/**
	 * Number of addrinfo nodes in linked list.
	 */
	uint32_t length;
} OMRAddrInfoNode;

For Unix, addrInfo has the definition:

struct addrinfo {
	int ai_flags;
	int ai_family;
	int ai_socktype;
	int ai_protocol;
	socklen_t ai_addrlen;
	struct sockaddr *ai_addr;
	char *ai_canonname;
	struct addrinfo *ai_next;
};

Unix Progress Tracker

• Implement omrsock_getaddrinfo_create_hints (and socket per thread buffer) PR:Added a per thread buffer and related tests for OMR socket API #4555

• Implement OMRAddrInfoNode element extraction (omrsock_getaddrinfo_length, family, socktype, protocol)

• Implementing omrsock_getaddrinfo

• Implementing omrsock_socket

• Implementing omrsock_bind and omrsock_listen

• Implementing omrsock_connect and omrsock_accept

• Implementing omrsock_send and receive

• Implementing omrsock_sendto and recvfrom

• Implementing omrsock_close