r/appsync_function - Support sync_config and max_batch_size

[DrFaust92]

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Requires #22411 (sync config only works for versioned data sources)

Output from acceptance testing:

$ make testacc TESTS=TestAccAppSync_serial/Function/sync PKG=appsync > a.txt
--- PASS: TestAccAppSync_serial (76.11s)
    --- PASS: TestAccAppSync_serial/Function (76.11s)
        --- PASS: TestAccAppSync_serial/Function/sync (76.11s)

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccAppSync_serial/Function PKG=appsync
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/appsync/... -v -count 1 -parallel 20 -run='TestAccAppSync_serial/Function'  -timeout 180m
=== RUN   TestAccAppSync_serial
=== RUN   TestAccAppSync_serial/Function
=== RUN   TestAccAppSync_serial/Function/description
=== RUN   TestAccAppSync_serial/Function/responseMappingTemplate
=== RUN   TestAccAppSync_serial/Function/sync
=== RUN   TestAccAppSync_serial/Function/basic
=== RUN   TestAccAppSync_serial/Function/disappears
--- PASS: TestAccAppSync_serial (195.92s)
    --- PASS: TestAccAppSync_serial/Function (195.92s)
        --- PASS: TestAccAppSync_serial/Function/description (42.38s)
        --- PASS: TestAccAppSync_serial/Function/responseMappingTemplate (26.53s)
        --- PASS: TestAccAppSync_serial/Function/sync (40.18s)
        --- PASS: TestAccAppSync_serial/Function/basic (53.85s)
        --- PASS: TestAccAppSync_serial/Function/disappears (32.98s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/appsync	200.972s

[ewbankkit]

@DrFaust92 Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v3.72.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.