fix(schema): add HttpApi, HttpApiFunctionAuth, RouteSettings

[gsweetwood]

Issue #, if available: Related schema issue in aws-toolkit-vscode: https://github.com/aws/aws-toolkit-vscode/issues/2867

Description of changes: This PR adds:

• HttpApi event source object
• HttpApiFunctionAuth
• RouteSettings (for the Function scope)

Documentation can be found here:

• https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-property-function-httpapi.html
• https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-property-function-httpapifunctionauth.html
• https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-apigatewayv2-stage-routesettings.html

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

Base: 6.15% // Head: 6.15% // No change to project coverage :thumbsup:

Coverage data is based on head (db34366) compared to base (3cff1ff). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #541 +/- ## ====================================== Coverage 6.15% 6.15% ====================================== Files 30 30 Lines 16463 16463 ====================================== Hits 1014 1014 Misses 15424 15424 Partials 25 25 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=awslabs). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=awslabs)

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[github-actions[bot]]

:tada: This PR is included in version 7.2.5 :tada:

The release is available on GitHub release

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