Fix memory exhaustion problem caused by the logger

[Phat3]

Checklist

Which kind of PR do you create?

• This PR only contains minor fixes.
• This PR contains major feature update.
• This PR introduces a new function/api for Qiling Framework.

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• The new code conforms to Qiling Framework naming convention.
• The imports are arranged properly.
• Essential comments are added.
• The reference of the new code is pointed out.

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• I have added enough tests for this PR.
• Tests will be added after some discussion and review.

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Hi!

This PR is a proposed fix for a memory exhaustion problem I found while creating multiple Qiling objects. Here's a snippet of code that triggers the bug:

import time
import qiling


with open('/usr/bin/true', 'rb') as f:
    CODE = f.read()

def create_ql_instance():
    ql = qiling.Qiling(code=CODE, archtype='x8664', ostype='linux')

for i in range(1000):
    create_ql_instance()
    print("Allocating")
    time.sleep(0.1)

This snippet will eventually saturate the RAM and the SWAP because the Qiling objects are not properly garbage collected.
The problem here is that when the Qiling object gets out of scope the Python root log manager still holds a reference to it. This is caused by the fact that the logger formatter needs to have a reference to it so it can retrieve the current thread information while formatting the log message.
Substituting the reference with a weak reference solves the problem since now when the object goes out of scope only weak references are pointing to it and therefore the garbage collector is allowed to free the space.