Add implementations for DataFrame Algebra.

[RehanSD]

Is your feature request related to a problem? Please describe. A clear and concise description of what the problem is. What kind of performance improvements would you like to see with this new API?

Inspired by #2656. Now that we've begun refactoring the Modin Dataframe to include the algebra operators, we need to implement them. Each operator has its own issue. The operators are:

• [ ] concat
• [x] explode
• [ ] groupby
• [ ] infer_types in progress
• [ ] join [Not started](https://github.com/modin-project/modin/issues/656, https://github.com/modin-project/modin/issues/1356)
• [ ] filter [In Progress](https://github.com/modin-project/modin/pull/2744, https://github.com/modin-project/modin/issues/1360)
• [ ] filter_by_types In Progress
• [ ] map In Progress
• [ ] mask [In Progress](https://github.com/modin-project/modin/pull/2744, https://github.com/modin-project/modin/issues/1359)
• [ ] reduce In Progress
• [ ] tree_reduce In Progress
• [ ] from_labels In Progress
• [ ] to_labels In Progress
• [ ] rename In Progress
• [ ] sort_by
• [ ] transpose
• [ ] window

[devin-petersohn]

@mvashishtha Plans to add explode.

[YarShev]

@RehanSD, @mvashishtha, any plans on this?