Support creating empty files for streams with at least one `SCHEMA` message but no `RECORD` messages

[edgarrmondragon]

I don't think that's possible with the way target-csv currently works. The logic to write to the file, and more importantly here create if it doesn't exist, lives in the process_batch implementation:

target-csv/target_csv/sinks.py

Lines 103 to 108 in 47a1c76

	write_csv(
	output_file,
	context["records"],
	self.schema,
	escapechar=self.config.get("escape_character"),
	)

My guess is that it's never called for empty streams because the method is only called when a "batch" is full, but that never happens for the stream in question. One fix I can think of is to add an optional early file creation step controlled by a new setting (e.g create_files_for_empty_streams), maybe within the Sink class __init__ method.

https://meltano.slack.com/archives/C069CQNHDNF/p1718436121705219?thread_ts=1718426268.425619&cid=C069CQNHDNF