feat(chainspec): wrap upstream tempo chainspec

[0xKitsune]

This PR updates ZoneChainSpec to wrap the upstream Tempo chainspec, making it aware of both the Tempo and Zone hardfork schedules.

Ref #626

[0xrusowsky]

looks good directionally, but left a suggestion and a question

[tempo-voight-kampff]

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[adityapk00]

lgtm

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