aws-apigateway-dynamodb enable passing of methodOptions for use in addProxyMethodToApiResource

The addProxyMethodToApiResource accepts a params.methodOptions to be able to override/complement the default options defined

https://github.com/awslabs/aws-solutions-constructs/blob/dc48e482f936c856398c7e600a7805a99a3bea44/source/patterns/%40aws-solutions-constructs/core/lib/apigateway-helper.ts#L324

unfortunately the aws-apigateway-dynamodb construct does not pass this in its call the the addProxyMethodToApiResource method e.g

https://github.com/awslabs/aws-solutions-constructs/blob/dc48e482f936c856398c7e600a7805a99a3bea44/source/patterns/%40aws-solutions-constructs/aws-apigateway-dynamodb/lib/index.ts#L265

### Use Case

Overriding default headers to specify CORS values would be a great use case to do it whilst overriding the default method responses.

### Proposed Solution

Be able to pass in methodOptions as aditional opitional attribute . e.g : createIntegrationMethodOptions

* [ ] :wave: I may be able to implement this feature request
* [ ] :warning: This feature might incur a breaking change

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This is a :rocket: Feature Request

Start in source/patterns/@aws-solutions-constructs/aws-apigateway-dynamodb/lib/index.ts at the addProxyMethodToApiResource call, then inspect the methodOptions parameter in source/patterns/@aws-solutions-constructs/core/lib/apigateway-helper.ts. Confirm how an optional methodOptions value should be exposed and forwarded. Done means callers can override or extend the default method options, including CORS-related values.

Written by the indexing model from the issue text.