Check all plugins to be added by create command

[kinetifex]

Description

We need to expose an allPlugins getter method from create context for listing all plugins including those from presets. This will be useful for condition checks during the prompt and create lifecycles.

We do a check like this here, but we should expose a simpler helper which lifecycle hooks can also utilize.

Package(s): @gasket/cli

AC:

• Ability to check if a plugin has been added for installation during prompt or create lifecycles.