src: add ruleset generation class

The generation object currently only contains the uint32_t that
indicates the generation ID. I could have just add the API to return
the uint32_t ID instead, but I think this API is easier to extend
without adding new APIs.

We can probably include meaningful statistics in the generation
message in the future without much hassle.

This patch also extends examples/nft-events.c.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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