Extract `Aggregate`, `Sort`, `Join` in LogicalPlan as independent struct

[xudong963]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
There are some discussions in #1228

Describe the solution you'd like
like #1290

Describe alternatives you've considered
The task is mechanical, however, it is ideal for newcomers to familiarize themselves with datafusion's build, test, and PR processes.

Additional context
If you want to do it, please ping me and assign the task to you, avoiding collisions with other people.

[matthewmturner]

ill give this a shot

[xudong963]

ill give this a shot

Thanks! @matthewmturner