feat: Allow coroutine lifecycles + support thisArg + remove engine requirement

[eonarheim]

===:clipboard: PR Checklist :clipboard:===

• 📌 issue exists in github for these changes
• 🔬 existing tests still pass
• 🙈 code conforms to the style guide
• 📐 new tests written and passing / old tests updated with new scenario(s)
• 📄 changelog entry added (or not needed)

==================

This PR adds an optional ex.coroutine timing parameter as an option bag to schedule when they are updated

const result = ex.coroutine(engine, function * () {...}, { timing: 'postupdate' })

This PR also adds a way to set the this parameter for a generator

const result = ex.coroutine({myThis: 'value'}, engine, function * () {...})

Additionally this PR removes the requirement to pass engine if done so under an Excalibur lifecycle

  const result = ex.coroutine(function * () {...});

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