examples/aio_pika_server.py: Fix example add_user() to not trigger mypy

[bernhardkaindl]

Hello!

This is a minor improvement to fix mypy of a currently not used RPC endpoint function in examples/aio_pika_server.py:

Details:

The add_user() example in examples/aio_pika_server.py is not yet used by the example client, so it can be fixed for mypy using dataclasses similar to the example add_user() with dataclasses at the end of README.rst: https://github.com/dapper91/pjrpc/blob/master/README.rst#open-api-specification

-def add_user(message: aio_pika.IncomingMessage, user: dict):
-    user_id = uuid.uuid4().hex
-
-    return {'id': user_id, **user}
+def add_user(message: aio_pika.IncomingMessage, user_info: UserInfo) -> AddedUser:
+    """Simluate the creation of a user: Receive user info and return it with an uuid4.
+    :param UserInfo user_info: user data
+    :returns: user_info with a randomly generated uuid4 added
+    :rtype: AddedUser"""
+    return AddedUser(**user_info.__dict__, uuid=uuid.uuid4())

@dapper91: The 1st commit of this branch is the commit from #89 as it's context depends on it. It can be merged after (or instead of) #89.

It reduces the coverage percentage very slightly because the updated lines in the unused function is not yet covered. If this is approved or merged, a test case covering using RabbitMQ in the github actions:

• https://stackoverflow.com/questions/61678292/how-to-setup-rabbitmq-service-with-github-actions
• https://github.com/marketplace/actions/rabbitmq-in-github-actions
• http://www.thedreaming.org/2019/09/10/github-ci/

[codecov-commenter]

Codecov Report

Merging #90 (5b168b4) into dev (064c5c6) will increase coverage by 0.05%. The diff coverage is 97.63%.

@@            Coverage Diff             @@
##              dev      #90      +/-   ##
==========================================
+ Coverage   79.49%   79.55%   +0.05%     
==========================================
  Files          41       41              
  Lines        2717     2719       +2     
==========================================
+ Hits         2160     2163       +3     
+ Misses        557      556       -1     

Flag	Coverage Δ
unittests	79.55% <97.63%> (+0.05%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pjrpc/client/backend/aio_pika.py	0.00% <0.00%> (ø)
pjrpc/client/backend/kombu.py	0.00% <0.00%> (ø)
pjrpc/__about__.py	100.00% <100.00%> (ø)
pjrpc/client/client.py	97.55% <100.00%> (ø)
pjrpc/client/integrations/pytest.py	91.85% <100.00%> (ø)
pjrpc/common/__init__.py	91.66% <100.00%> (ø)
pjrpc/common/common.py	89.28% <100.00%> (+0.82%)	:arrow_up:
pjrpc/common/exceptions.py	98.64% <100.00%> (ø)
pjrpc/common/v20.py	91.22% <100.00%> (ø)
pjrpc/server/dispatcher.py	87.73% <100.00%> (+0.04%)	:arrow_up:
... and 5 more

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