Config schema: Define AWS "alb" function event properties

[medikoo]

Use case description

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

Proposed solution

1. Define schema for following properties at provider level (that's part of Config schema: Define AWS "provider" properties #8022)

• alb

Should be done directly in: lib/plugins/aws/provider/awsProvider.js:

serverless/lib/plugins/aws/provider/awsProvider.js

Lines 141 to 142 in d403d9c

	// TODO: Complete schema, see https://github.com/serverless/serverless/issues/8016
	serverless.configSchemaHandler.defineProvider('aws', {

2. Define schema of all alb event properties

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

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

Lines 31 to 32 in d403d9c

	// TODO: Complete schema, see https://github.com/serverless/serverless/issues/8020
	this.serverless.configSchemaHandler.defineFunctionEvent('aws', 'alb', { type: 'object' });