expose target_file_size in python side for WriterProperties

[deanm0000]

Description

In optimize.z_order and optimize.compact there is the target_size parameter but at an initial write the target size isn't an available parameter

Use Case

Related Issue(s)

[ion-elgreco]

@deanm0000 after the fix you can do this also for first writes:

df.write_delta("test_table", mode='overwrite', delta_write_options={"configuration":{'delta.targetFileSize':str(2*104857600)}})

[deanm0000]

I was thinking this would stand alone from that fix so it'd show up in the docs here https://delta-io.github.io/delta-rs/api/delta_writer/#deltalake.write_deltalake

[ion-elgreco]

I can also expose target_file_size as well, will do that tomorrow :)