Add a new FuzzParseProtobuf fuzz target that exercises the protobuf
exposition-format parser
Reduce per-target fuzz time to 4m to keep budget acceptable with
the additional target.
Signed-off-by: Julien Pivotto <291750+roidelapluie@users.noreply.github.com>
Parser configuration is now per-engine/API/loader and no longer uses package-level flags, so behavior is consistent and tests don't rely on save/restore of global variables.
Signed-off-by: Martin Valiente Ainz <64830185+tinitiuset@users.noreply.github.com>