Is your feature request related to a problem or challenge?

Now we're able to set session configurations through SQL interface:

• Doc about config: https://datafusion.apache.org/user-guide/configs.html
• Example to set it through executing an SQL query:

  set datafusion.execution.batch_size = 1024;
  SELECT * FROM tbl ORDER BY c1;

However, runtime configurations like memory limit can't be set like this, it has to be set through Rust APIs during setup like the following example:

Although it's called RuntimeConfiguration, it's still some static parameters to be configured, instead of a long-running daemon. So I think it make sense to be able to change it from query to query, and also provide a easier to use API.
Also, they don't have a user manual like SessionConfig.

Describe the solution you'd like

1. Add documents for runtime configurations like memory limit similar to SessionConfig to the user-guide.
2. Make it configurable through SQL interface.

Describe alternatives you've considered

No response

Additional context

No response