Setup custom router after creating the Application

[aamalev]

Use method of router to setup:

router.setup(app)

For aiohttp<4 use explicit param setup:

router:
   setup: true

Motivation:

• aiohttp>=4 not supported custom router as parameter of Application
• Use inside middleware ([fix] - make aiohttp.web.normalize_path_middleware work again aamalev/aiohttp_apiset#173)

[codecov]

Codecov Report

Patch coverage: 94.44% and project coverage change: +0.68 🎉

Comparison is base (95cbebf) 87.99% compared to head (d6dc4a7) 88.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
+ Coverage   87.99%   88.67%   +0.68%     
==========================================
  Files          14       15       +1     
  Lines         433      459      +26     
==========================================
+ Hits          381      407      +26     
  Misses         52       52              

Flag	Coverage Δ
unittests	88.67% <94.44%> (+0.68%)	⬆️

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

Impacted Files	Coverage Δ
aioworkers_aiohttp/app.py	86.17% <90.00%> (+1.35%)	⬆️
aioworkers_aiohttp/abc.py	100.00% <100.00%> (ø)
tests/test_app.py	100.00% <100.00%> (ø)
tests/test_app_router.py	100.00% <100.00%> (ø)

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