[fir] Update fir.extract_value and fir.insert_value ops

Move coor operand from variadic values to ArrayAttr.
Update assembly format.

This patch is part of the upstreaming effort from fir-dev branch.

Reviewed By: kiranchandramohan

Differential Revision: https://reviews.llvm.org/D110652



Co-authored-by: Jean Perier <jperier@nvidia.com>
Co-authored-by: Valentin Clement <clementval@gmail.com>