[SPARK-53314] Add DataStreamReader and DataStreamWriter convenience methods

[rafafrdz]

Summary

• Add csv(), json(), orc(), parquet(), text() convenience methods to DataStreamReader, each accepting a path and ConfigOpts config
• Add table() method to DataStreamReader for reading a stream from a named table
• Add csv(), json(), orc(), parquet(), text() convenience methods to DataStreamWriter, each delegating to format().start()

Test plan

• cargo build passes
• cargo clippy passes
• cargo fmt -- --check passes
• Integration test with Spark Connect server (streaming sources)