Feature: Multi-language support via aws/jsii

[KyleTryon]

Enable support to utilize the CircleCI Config SDK with multiple target languages beyond TypeScript and JavaScript by utilizing aws/jsii.

Language Support

JSII build support is targeted for the 1.0.0 release of the CircleCI Config SDK. Language support is dependant on the current availability in the library.

Language	Version
TypeScript	1.0.0
JavaScript	1.0.0
Python	1.0.0
Java	1.0.0
C#	1.0.0
Kotlin	TBD
Go	TBD

(https://aws.github.io/jsii/overview/features/#target-languages)

🚨 Blocking Issue 🚨

Current patterns utilized in the Config SDK which are appropriate for TypeScript are not available in the JSII build system due to compatibility with .NET Core 3.1.

In the current design, Components are extended from an abstract class where a generate() function is defined. This function will return the JSON schema of the component. Components such as jobs, commands, executors and workflows all extend Component, but each carry more specific definitions for their generate() function. This overriding of type of the generate() command is allowed in TypeScript as long as the types overlap, however in JSII this functionality is not available.

Issues on aws/jsii

• Enable base class members overriding aws/jsii#2314
• How to override return types of methods from children - JSII5003 aws/jsii#3068

Alternative Solutions:

An alternative design pattern must be considered to resolve the issue described above, allowing the use of JSII, without losing type defintions.