Feature: Auto-generate OIDs if sequential

[jbemmel]

srl-snmp-framework-lab/table_definition_schema.json

Line 176 in db00e66

"oid": {

Since the OID needs to be based on the parent anyway, it would be great to allow the user to omit it if it is simply one increment beyond the previous one

Providing a value would reset the iteration, to allow for skipping certain OID values/ranges if needed