perf parse-events: Add parse_uid_filter helper

perf parse-events: Add parse_uid_filter helper

Add parse_uid_filter filter as a helper to parse_filter, that
constructs a uid filter string. As uid filters don't work with
tracepoint filters, add a is_possible_tp_filter function so the
tracepoint filter isn't attempted for tracepoint evsels.

Signed-off-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20250604174545.2853620-4-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>