Introduce pulumiResourceNamePrefix Parameter

[adrians5j]

Changes

In order to prefix all cloud infrastructure (Pulumi) resource names, users had to use the following piece of code in their webiny.application.ts files:

import { createWebsiteApp } from "@webiny/serverless-cms-aws";

export default createWebsiteApp({
    pulumi: app => {
        app.onResource(resource => {
            if (!resource.name.startsWith("wby-")) {
                resource.name = `wby-${resource.name}`;
            }
        });
    }
});

This PR makes this a bit nicer, by introducing the pulumiResourceNamePrefix parameter. With it, prefixing all resources now looks like the following:

import { createWebsiteApp } from "@webiny/serverless-cms-aws";

export default createWebsiteApp({
    pulumiResourceNamePrefix: "wby-"
});

Why is this important? It's because of the #2856 and the fact that the new CWP CloudFormation template now expects the wby- prefix in deployed resource names. Which means, all new Webiny projects will now be deployed with the wby- prefix applied OOTB, via the generated webiny.application.ts files (we've updated the @webiny/cwp-template-aws package).

How Has This Been Tested?

Manually.

Documentation

Updated package README and will add this to the changelog.