add kwargs into run_app func.

[serjshevchenko]

Fix error "Got more than 8190 bytes (11194) when reading Header value is too long."

[codecov-io]

Codecov Report

Merging #3861 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3861      +/-   ##
==========================================
- Coverage   97.96%   97.93%   -0.03%     
==========================================
  Files          43       43              
  Lines        8588     8588              
  Branches     1373     1373              
==========================================
- Hits         8413     8411       -2     
- Misses         71       72       +1     
- Partials      104      105       +1

Impacted Files	Coverage Δ
aiohttp/web.py	99.1% <ø> (ø)	⬆️
aiohttp/web_fileresponse.py	96.55% <0%> (-1.15%)	⬇️

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[asvetlov]

I understand your motivation but disagree with implementation.
I think we should go in the opposite direction: get rid of `**kwargs`` usage but enumerate and pass all parameters explicitly.
It increases the code readability and provides better type annotations.

[asvetlov]

Closing by the lack of interest by @serjshevchenko