Config schema: Define AWS "cloudFront" function event properties

[medikoo]

Use case description

It'll be nice to have cloudFront event fully covered by schema validation

Proposed solution

Follow up to #6562, with which only schema placeholder for event was configured.

Define schema of all cloudFront event properties

Should be done directly in: lib/plugins/aws/package/compile/events/cloudFront/index.js:

serverless/lib/plugins/aws/package/compile/events/cloudFront/index.js

Lines 30 to 33 in d403d9c

	// TODO: Complete schema, see https://github.com/serverless/serverless/issues/8025
	this.serverless.configSchemaHandler.defineFunctionEvent('aws', 'cloudFront', {
	type: 'object',
	});