[FEATURE]: Add function to restage an app

[vipinvkmenon]

Currently, there is a utility function to restart apps, but not to restage. We need to add a function to restage an app

[sneal]

Good callout, looks slightly more complicated in v3 than restart. Might need to go under operation package since it's orchestrating things? I haven't really thought it through yet. https://v3-apidocs.cloudfoundry.org/version/3.202.0/index.html#deprecated-endpoints