feat(apigateway): add binaryMediaTypes property to SpecRestApi

[matoom-nomu]

Issue #35498

Reason for this change

The SpecRestApi construct was missing the binaryMediaTypes property that is available in the regular RestApi construct.

Description of changes

• Added binaryMediaTypes property to SpecRestApiProps interface**: This property accepts an array of strings representing binary media types (e.g., ['image/png', 'application/pdf'])
• Updated SpecRestApi constructor**: Modified to pass the binaryMediaTypes property to the underlying CfnRestApi resource
• Updated README documentation: Added usage example showing how to use binaryMediaTypes with SpecRestApi

Describe any new or updated permissions being added

N/A

Description of how you validated changes

• Added unit tests: Created tests to verify that the binaryMediaTypes property is correctly passed to CloudFormation
• Added integration tests: Updated existing integration test to include binaryMediaTypes configuration

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[kumsmrit]

Thank you for your contribution. I have added a minor review comment.

[kumsmrit]

nit: RestApi -> SpecRestApi

[matoom-nomu]

i fixed comment, thanks for review.

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[mergify]

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