Create a method to return a spark df for pyspark backend

[sonic-x11]

Is your feature request related to a problem?

No response

What is the motivation behind your request?

If we return a spark df the user can write to various formats as spark supports in my case it was hudi

Describe the solution you'd like

Create a simple to_spark or similar method which returns a spark df

currently there is hacky workaround pointed out by @gforsyth

#10671 (comment)

What version of ibis are you running?

9.5

What backend(s) are you using, if any?

Pyspark and duckdb

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