Streaming request payloads

[howardlopez]

• Adds support for 'requiresLength' trait, adding headers as necessary for streaming operations.

[codecov-io]

Codecov Report

Merging #1797 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master   #1797      +/-   ##
===========================================
+ Coverage     94.17%   94.2%   +0.02%     
- Complexity     3072    3087      +15     
===========================================
  Files           180     181       +1     
  Lines          8213    8252      +39     
===========================================
+ Hits           7735    7774      +39     
  Misses          478     478

Impacted Files	Coverage Δ	Complexity Δ
src/AwsClient.php	100% <100%> (ø)	36 <1> (+1)	⬆️
src/StreamRequestPayloadMiddleware.php	100% <100%> (ø)	14 <14> (?)

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