Parallel Module Loading: Add performance mode

Add the performance mode. It improved parallel module loading performance by enabling the main thread to identify any new independent modules without waiting for subthreads to load all the old independent threads.

Bug: 385049709
Change-Id: I638bc2d7d8fea6457be503c2b7aecd975250835a
Signed-off-by: Chungkai Mei <chungkai@google.com>