Add an example of how to convert LogicalPlan to/from SQL Strings

[alamb]

Part of #9494

Is your feature request related to a problem or challenge?

Having a good example helps to make features easier to use in DataFusion

In this case the usecase is programmatic construction of SQL using the DataFUsion LogicalPlan s using the api from #9726

Describe the solution you'd like

Extend the example from @edmondop 's great work in #10528 with the following cases:

1. Create a plan using the DataFrame API and converting it back to SQL

Bonus points for also adding
3. Parse SQL like SELECT * from foo into a DataFrame, adding a filter, and then converting that back to SQL

Describe alternatives you've considered

Here is an example of creating a dataframe example https://docs.rs/datafusion/latest/datafusion/index.html#dataframe

You can call DataFrame::logical_plan to get the plan

Then call plan_to_sql and demonstrate the SQL that was created

https://github.com/apache/datafusion/blob/842f3933e3496a022984c2a37254475a3bcde1bf/datafusion/sql/tests/sql_integration.rs#L4689C1-L4690C51

Additional context

No response