Extreme slow down when using Map#lock/unlock from multiple threads [API-1968]

Running the [Pessimistic Locking](https://docs.hazelcast.com/hazelcast/5.2/data-structures/locking-maps#pessimistic-locking) example from multiple threads using the same client takes vastly different amounts of time.

The sequential runs of the same code can give:
```
It took 68.364421721 second(s) to finish.
It took 2666.208992902 second(s) to finish.
```
Using one Hazelcast instance. The behaviour is reproducible on MacOS and Linux. Using python3

The code sample:

```
import hazelcast
from time import perf_counter
from concurrent.futures import ThreadPoolExecutor
from threading import Thread

if __name__ == "__main__":
client = hazelcast.client.HazelcastClient(
cluster_name="dev",
lifecycle_listeners=[
lambda state: print("Lifecycle event >>>", state),
]
)

# Defining send_query func and pooled_query func, to send requests using ThreadPoolExecutor
desired_range = range(10000)
desired_threads = 10

# Create a Distributed Map in the cluster
counter_map = client.get_map("counter-map").blocking()

counter_map.put("key", 0)

# Pesimistic Locking
def send_query(range_parameter):
for i in range_parameter:
counter_map.lock("key")
try:
counter = counter_map.get("key") + 1
counter_map.put("key", counter)
finally:
counter_map.unlock("key")

def pooled_query():
# create the thread pool
n_threads = desired_threads
with ThreadPoolExecutor(n_threads) as executor:
# push query for each thread
_ = [executor.submit(send_query, desired_range) for i in range(0, desired_threads)]

def pooled_query_thread():
threads = []
for i in range(desired_threads):
thread = Thread(target=send_query, args=(desired_range,))
threads.append(thread)

for thr in threads:
thr.start()

for thr in threads:
thr.join()

## Timer start
start = perf_counter()

## Invoke ThreadPoolExecutor to send requests
if __name__ == "__main__":
# pooled_query()
pooled_query_thread()

## Timer end
finish = perf_counter()

print(f'It took {finish-start} second(s) to finish.')

for key, value in counter_map.entry_set():
print(key, value)

client.shutdown()
```