Support N-x configuration for To option to skip trailer rows

Summary

In csv-parse, the 'to' and 'to_line' options do not adequately support stripping trailing records. Recommend adding functionality that would either allow a syntax to these options, eg: 'T.1' to indicate stopping at end-1.

Motivation

We process some files that include a trailing "summary" record for the file. These are difficult to deal with.

Alternative

We could pre-process the file to strip these trailing rows, but it can be tricky if they contain fields with embedded newlines in field.

Draft

This can be easily implemented by dropping each parsed row into a holding queue; by pushing the configured "T-minus" row along the pipe rather than the current one, and simply dropping the queue at EOF.

Additional context

Add any other context or screenshots about the feature request here.

Start by locating the handling for the to and to_line options and the parser's end-of-file path, then inspect the existing parser tests. Confirm how a trailing-record offset should be represented and verify that configured trailing records are omitted without changing current stopping behavior.