add MonoBehaviour Public Methods snippets and contributors

[TD12734]

I added the following snippet of MonoBehaviour Public Methods.

• CancelInvoke() (type cancelinvoke)
• Invoke() (type invoke)
• InvokeRepeating() (type invokerepeating)
• IsInvoking() (type isinvoking)
• StartCoroutine() (type startcoroutine)
• StopAllCoroutines() (type stopallcoroutines)
• StopCoroutine() (type stopcoroutine)

I personally use these functions quite often, so I added them now.

I also added the contributors in package.json.