Add support for multi-file uploads

[tiangolo]

✨ Add support for multi-file uploads.

[codecov]

Codecov Report

Merging #158 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #158   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files         160    162    +2     
  Lines        3918   3984   +66     
=====================================
+ Hits         3918   3984   +66

Impacted Files	Coverage Δ
docs/src/request_files/tutorial002.py	100% <100%> (ø)
fastapi/dependencies/utils.py	100% <100%> (ø)	⬆️
fastapi/routing.py	100% <100%> (ø)	⬆️
...st_tutorial/test_request_files/test_tutorial002.py	100% <100%> (ø)

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