Extract AccessLog into a separate module

[asvetlov]

To avoid circular refs

[codecov-io]

Codecov Report

Merging #3336 into master will decrease coverage by 0.02%.
The diff coverage is 95.61%.

@@            Coverage Diff             @@
##           master    #3336      +/-   ##
==========================================
- Coverage   98.01%   97.99%   -0.03%     
==========================================
  Files          43       44       +1     
  Lines        8025     8039      +14     
  Branches     1356     1357       +1     
==========================================
+ Hits         7866     7878      +12     
- Misses         66       67       +1     
- Partials       93       94       +1

Impacted Files	Coverage Δ
aiohttp/web.py	98.85% <100%> (+0.01%)	⬆️
aiohttp/base_protocol.py	97.1% <100%> (ø)	⬆️
aiohttp/web_app.py	95.8% <100%> (+0.01%)	⬆️
aiohttp/web_protocol.py	92.52% <100%> (ø)	⬆️
aiohttp/helpers.py	97.64% <100%> (+0.18%)	⬆️
aiohttp/web_request.py	98.15% <100%> (ø)	⬆️
aiohttp/worker.py	99.07% <100%> (ø)	⬆️
aiohttp/client_proto.py	95.13% <60%> (-1.29%)	⬇️
aiohttp/web_log.py	96.93% <96.93%> (ø)

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If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new