added near chain support

[ali-sultani]

Added Near chain.

Issue: https://github.com/pinax-network/pinax-stories/issues/220

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Name	Status	Preview	Comments	Updated (UTC)
subtivity-substreams	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 10, 2023 8:10pm

[chamorin]

LGTM 🙌