Add test to parse lf/crlf metadata

Unix-like platforms represent line endings in text file with a '\n' or
LF while Windows uses '\r\n' or CRLF. The CTF standard doesn't specify a
canonical representation for metadata files and only requires whitespace.

Test both styles of line endings on all platforms to ensure
interoperability of the produced metadata files.

Change-Id: Ib4080b1d95be2fb0d5844e7772bd6c2832de378a
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/11078
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>