feat(schema): serverless http api cors configuration

[konoui]

Issue #, if available:
#403

Description of changes:

Fix CorsConfiguration for AWS::Serverless::HttpApi,

• AllowMethods/AllowHeaders/AllowOrigins properties are List instead of String.
• allow-origin property is AllowOrigins not AllowOrigin
• MaxAge property is Integer instead of String

Note: Current definition seems to be the same as CorsConfiguration for AWS::Serverless::Api but they are incorrect.

Ref:
HttpApiCorsConfiguration
https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-property-httpapi-httpapicorsconfiguration.html

Cors Configuration Object
https://github.com/aws/serverless-application-model/blob/master/versions/2016-10-31.md#cors-configuration-object

CorsConfiguration:
  AllowMethods: Optional. List containing the HTTP methods to allow for the HttpApi.  
  AllowHeaders: Optional. List of headers to allow. 
  AllowOrigins: Optional. List of origins to allow. 
  MaxAge: Optional. Integer containing the number of seconds to cache CORS Preflight request. 
  # For example, 600 will cache request for 600 seconds.
  AllowCredentials: Optional. Boolean indicating whether request is allowed to contain credentials.
  ExposeHeaders: Optional. List of allowed headers

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

Merging #485 (aea501b) into master (83f2d49) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #485      +/-   ##
=========================================
- Coverage    6.34%   6.31%   -0.03%     
=========================================
  Files          30      30              
  Lines       15624   15613      -11     
=========================================
- Hits          991     986       -5     
+ Misses      14612   14606       -6     
  Partials       21      21              

Impacted Files	Coverage Δ
cloudformation/intrinsics.go	46.93% <0.00%> (+0.07%)	⬆️

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[rubenfonseca]

Thank you very much for this! Updating the SAM schema is hard, and we really appreciate any kind of help. I'm merging and releasing a new minor version.

[github-actions]

🎉 This PR is included in version 6.9.0 🎉

The release is available on GitHub release

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