DataStore to establish Subscription with server-side filtering

[lawmicha]

DataStore translates the syncExpression over to the filter predicate on the GrapQL query. When DataStore performs a sync query, the filter is added, to perform server side filtering. When DataStore establishes the subscriptions, the filtering is applied on the client side.Since the subscription filtering feature released in April 2022, customers can provision AppSync with the filter input capability on their subscription operations. DataStore can now leverage this by passing in filter to the subscription request.

1. We attempt the subscription with the filter and catch ther error
2. Handle the specific "RTF" error as a retry without the filter for backwards compatibility.

References
https://github.com/aws-amplify/amplify-js/blob/main/packages/datastore/src/sync/processors/subscription.ts#L467-L492

https://github.com/aws-amplify/amplify-js/blob/main/packages/datastore/src/sync/processors/subscription.ts#L677-L682C10

This logic allows for backwards compatibility with AppSync backends without the subscription filter capability.

Originally posted by @lawmicha in aws-amplify/amplify-swift#3550 (comment)

[github-actions]

This issue was opened by a maintainer of this repository; updates will be posted here. If you are also experiencing this issue, please comment here with any relevant information so that we're aware and can prioritize accordingly.