[core] Move Schedule classes to core and remove duplicates

[civilizeddev]

❓ General Issue

The Question

aws-cdk/packages/@aws-cdk/aws-applicationautoscaling/lib/schedule.ts

Lines 3 to 6 in d80efae

	/**
	* Schedule for scheduled scaling actions
	*/
	export abstract class Schedule {

aws-cdk/packages/@aws-cdk/aws-autoscaling/lib/schedule.ts

Lines 1 to 4 in d80efae

	/**
	* Schedule for scheduled scaling actions
	*/
	export abstract class Schedule {

aws-cdk/packages/@aws-cdk/aws-events/lib/schedule.ts

Lines 3 to 6 in d80efae

	/**
	* Schedule for scheduled event rules
	*/
	export abstract class Schedule {

The classes above are almost the same.

What about moving them all to @aws-cdk/core and remove duplicates?

It will be more useful in the core module.

Environment

• CDK CLI Version: 1.50.0
• Module Version: 1.50.0
• Node.js Version: 14.5.0
• OS: macOS Catalina
• Language (Version): TypeScript (3.9.6)

Other information

• See if we can provide a single API for construcing Cron expressions #1181
• Add a construct to make/schedule AWS API calls #2538
• appsync - apiKeyConfig expires outputting incorrect format #8698 (comment)

[eladb]

Sounds good. Happy to take a contribution.

[github-actions]

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