feat(appsync): add the grant method to the imported GraphqlApi

[badmintoncryer]

Issue

Closes #23031.

Reason for this change

The grantXx methods are implemented in the GraphqlApi class, but it could not be used with an imported graphql api.

Description of changes

Moved the implementation of the grantXx method from the GraphqlApi class to the GraphqlApiBase class."

Description of how you validated changes

I've added both unit and integ tests.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

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

[aws-cdk-automation]

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✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[go-to-k]

Looks good.

[badmintoncryer]

@go-to-k Thanks!

[colifran]

Looks good -- nice job!

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[badmintoncryer]

@mergify update

[mergify]

update

❌ Mergify doesn't have permission to update

For security reasons, Mergify can't update this pull request. Try updating locally.
GitHub response: refusing to allow a GitHub App to create or update workflow .github/workflows/request-cli-integ-test.yml without workflows permission

[badmintoncryer]

@colifran mergify cannot update this PR. How should I do..??

[aws-cdk-automation]

This PR cannot be merged because it has conflicts. Please resolve them. The PR will be considered stale and closed if it remains in an unmergeable state.

Pull request has been modified.

[badmintoncryer]

@colifran
The Mergify job failed to merge this branch due to a conflict, which I have now resolved. Please review this PR again.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 6427a9f
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).