Add support for batch save models in DataStore

[thisisabhash]

Is your feature request related to a problem? Please describe.

[On behalf of a customer]
Currently, Datastore supports storing one item at a time:

Amplify.DataStore.save(_ model: M, where condition: QueryPredicate? = nil)

Describe the solution you'd like

An API to save a list or batch of items. Something like:

Amplify.DataStore.save(_ model: [M], where condition: QueryPredicate? = nil)

Describe alternatives you've considered

None

Is the feature request related to any of the existing Amplify categories?

DataStore

Additional context

A similar issue is opened for the API category: #3434

[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.

[github-actions]

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[thisisabhash]

We'll post future updates on this feature request here.