(appsync): add syncConfig to Resolver and AppsyncFunction

[mazyu36]

Describe the feature

Add sync config property to Resolver and AppsyncFunction.
This property can be used in L1 Construct.

https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_appsync.CfnResolver.html#syncconfig
https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_appsync.CfnFunctionConfiguration.html#syncconfig

Use Case

To set a Sync configuration for a resolver.

Proposed Solution

Add missing property to the L2 constructs.

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.141.0

Environment details (OS name and version, etc.)

MacOS

[ashishdhingra]

Looks like a valid feature request.