feat: support packageManager via nativescript.config

[NathanWalker]

Is your feature request related to a problem? Please describe.

Currently when switching between yarn workspace enabled projects to npm bound workspaces we need to switch the cli package-manager properly.

Describe the solution you'd like

Instead the cli should look for:

import { NativeScriptConfig } from '@nativescript/core';

export default {
	id: 'org.nativescript.app',
	android: {
		v8Flags: '--expose_gc',
		markingMode: 'none',
	},
	appPath: 'src',
        // New CLI properties
	cli: {
		packageManager: 'yarn',
	}
} as NativeScriptConfig;

To determine it's package-manager settings when running/building projects.

Describe alternatives you've considered

Possibly using .nsrc however the nativescript.config is perfect place to manage this option.

Additional context

Pains when switching between yarn enabled project workspaces to plugin workspaces you have to be sure cli package-manager is set right.

[NathanWalker]

implemented on next now 🚀