tools/rtla: Add common_parse_options()

tools/rtla: Add common_parse_options()

Each rtla tool duplicates parsing of many common options. This creates
maintenance overhead and risks inconsistencies when updating these
options.

Add common_parse_options() to centralize parsing of options used across
all tools.

Common options to be migrated in future patches.

Changes since v1:
- restore opterr

Signed-off-by: Costa Shulyupin <costa.shul@redhat.com>
Link: https://lore.kernel.org/r/20251209100047.2692515-1-costa.shul@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>