Fix InMemoryBroker to use startup and shutdown middleware hooks

[PythonFZ]

A copy/paste approach + test similar to #358

Instead of relying on super calls this PR just copy + pastes

taskiq/taskiq/abc/broker.py

Lines 196 to 198 in 9f8db96

	for middleware in self.middlewares:
	if middleware.__class__.startup != TaskiqMiddleware.startup:
	await maybe_awaitable(middleware.startup())

and

taskiq/taskiq/abc/broker.py

Lines 217 to 219 in 9f8db96

	for middleware in self.middlewares:
	if middleware.__class__.shutdown != TaskiqMiddleware.shutdown:
	await maybe_awaitable(middleware.shutdown())

into the methods of class InMemoryBroker(AsyncBroker) and adds a simple test case checking ensuring startup and shutdown work and the order of execution is correct.

[PythonFZ]

@s3rius Thanks for approving the PR. Could you re-run the CI / merge main again. The error doesn't seem to be related to the changed I made.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.87%. Comparing base (c4b8666) to head (979eb13).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #629      +/-   ##
==========================================
+ Coverage   82.63%   82.87%   +0.23%     
==========================================
  Files          69       69              
  Lines        2730     2739       +9     
==========================================
+ Hits         2256     2270      +14     
+ Misses        474      469       -5     

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