feat(appsync): add support for GraphQLApi environment variables

[onlybakam]

Reason for this change

AppSync introduced a new property on the L1 cfn resource AWS::AppSync::GraphQLApi: EnvironmentVariables. This change adds the functionality on the L2 appsync.GraphqlApi construct.

Description of changes

Changes are in aws-appsync/lib/graphqlapi.ts. Updated the GraphqlApi props to take in a new environmentVariables object. Added a new public function addEnvironmentVariable that adds an environment variable to the API.

Create a new API with env vars:

const api = new appsync.GraphqlApi(stack, 'baseApi', {
  name: 'api',
  schema: appsync.SchemaFile.fromAsset(...),
  environmentVariables: {
    key: 'value',
  },
});

Add a new env var:

api.addEnvironmentVariable('new_key', 'another');

Description of how you validated changes

• added new unit test: appsync-env-vars.test.ts
• added new integration test: integ.appsync-env-vars.ts

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

[aws-cdk-automation]

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[hoegertn]

How does this relate to #29064

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

[onlybakam]

How does this relate to #29064

did not see this before; but this is awesome and essentially the same! I can close this PR.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 2c8e3e7
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