[9.0] Add caches to asn1_utils for better performance

[chrisburr]

BEGINRELEASENOTES

*Core
NEW: Add caches to asn1_utils for better performance

ENDRELEASENOTES

[chrisburr]

I added the following to get some instrumentation on the cache:

import threading
import time

def cache_stats_monitor():
    while True:
        print("Cache stats for _extensionsFromCertDER:", _extensionsFromCertDER.cache_info())
        print("Cache stats for _decodeDIRACGroup  :", _decodeDIRACGroup.cache_info())
        # Wait for 5 seconds before printing the stats again
        time.sleep(5)

# Create and start a daemon thread to run the cache statistics monitor
monitor_thread = threading.Thread(target=cache_stats_monitor, daemon=True)
monitor_thread.start()

Cache stats for _extensionsFromCertDER: CacheInfo(hits=27212, misses=55, maxsize=1024, currsize=55)
Cache stats for _decodeDIRACGroup  : CacheInfo(hits=9106, misses=6, maxsize=128, currsize=6)