[api/suggestion] pulumi program inherit main

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Issue details

• #1

We could make programs less verbose by inheriting a main method.

old

public class App {
    public static void main(String[] args) {
        int exitCode = Pulumi.run(App::stack);
        System.exit(exitCode);
    }

    public static ExportContext stack(StackContext ctx) {
        ...
    }
}

new

public class App extends PulumiMain {
    public ExportContext stack(StackContext ctx) {
        ...
    }
}

Affected area/feature

Start by reading the existing Pulumi.run(App::stack) entry point and the proposed PulumiMain/App examples in the issue. Clarify the inheritance and lifecycle design with maintainers, then define what behavior must be demonstrated for the shorter program form to be considered complete.