Enable Pulumi resource config cloning

[Pavel910]

Changes

This PR adds an ability to clone a config of an existing Pulumi resource.

Code sample:

import * as aws from "@pulumi/aws";
import { createApiApp } from "@webiny/serverless-cms-aws";

export default createApiApp({
    pulumiResourceNamePrefix: "wby-",
    pulumi(app) {
        const resource = app.resources.graphql.functions.graphql;

        /**
         * Create a clone of the main `graphql` function, but more powerful, and with maximum timeout.
         */
        const internalWorkerFn = app.addResource(aws.lambda.Function, {
            name: "wby-internal-worker",
            config: {
                ...resource.config.clone(),
                timeout: 900,
                memorySize: 3008
            }
        });

        /**
         * Assign the new worker function ARN to the main `graphql` function.
         */
        resource.config.environment(env => {
            return {
                variables: {
                    ...env?.variables,
                    WORKER_FUNCTION: internalWorkerFn.output.arn
                }
            };
        });
    }
});

How Has This Been Tested?

Manually.