Add partition files amount limit

[choseenonee]

Summary

This PR introduces the partition_files_limit parameter for CSV and Parquet output writers.

• Default: 1000 files
• Configurable: can be overridden in models.yml
• Ignored: if the --force flag is provided

CLI changes

• Renamed --continue-generation → --continue
• Renamed -F → -f

Testing notes

• The promptui package contains a data race that becomes visible when running tests with the -race flag and calling promptui.Run().
• To avoid breaking race-enabled test runs, such tests were isolated from the rest.

[ReverseTM]

I tried to test your changes, ran the program, outputting data to csv in partitioning mode, and when the limit of 1000 files was reached, I entered ‘N’ and the program crashed with a panic.

[ReverseTM]

Perhaps it would be beneficial to move confirm to the render package and generally implement it as a renderer structure method.

[ReverseTM]

It could be renamed to nopReadWriteCloser to match the standard library, but that's a matter of taste.