Add new helpful Entity Extensions

[MikeAlhayek]

Adding the following helpful extensions to entity:

• IEntity Alter<TAspect>(this IEntity entity, Action<TAspect> action)
• bool TryGet<T>(this IEntity entity, out T aspect)

The new extensions simplify the following already existing extensions:

• IEntity Alter<TAspect>(this IEntity entity, string name, Action<TAspect> action)
• bool TryGet<T>(this IEntity entity, string name, out T aspect)

[Piedone]

Any places in OC where these could be utilized?

[MikeAlhayek]

@Piedone I used one of the new extensions in OC now. The TryGet was recently added and we still don't seems to use it in OC yet.

[Piedone]

Looks good, but please wait for the builds to finish. GitHub Actions has an issue right now where they're queued and their start is delayed: https://www.githubstatus.com/.