fix: feed events should all be items. and fixed types

[cjbell]

• feed events should all be items.${type} as well as items:${type}
• make some generic types interfaces
• allow FeedEventPayload to accept a generic

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Latest commit: 6a8f7601cb45628da1d959371e3b12d8e8ab4e7f

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| Name | Type | | ------------------------------- | ----- | | @knocklabs/client | Patch | | client-example | Patch | | @knocklabs/react-core | Patch | | @knocklabs/react-native | Patch | | @knocklabs/react | Patch | | @knocklabs/react-native-example | Patch | | nextjs-example | Patch |

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