[BACKLOG-623] Update the extension point plugin to add remaining event metadata for transformations
	- starting OID sequence had a typo ( was 1.1.1.3 , should've been 1.6.1.3 )
	- to help prevent any further typos, centralized all OID's in a new constants class ( OID.java )
	- @Snmp annotations now reference the final attributes from that class